ENS.FR Accueil | ENS

ens.fr Website Information

Daily Unique Visits: 339,997

Daily Page Views: 2,719,976

Income Per Day: $2,720

Estimated Value: $2,937,600

This website is located in France and is using following IP address 129.199.166.211. See the complete list of popular websites hosted in France.

ens.fr is registered under .FR top-level domain. Please check other sites in .FR zone.

Website ens.fr is using the following name servers:

  • ns2.nic.fr
  • ext.lri.fr
  • ns.ens.fr
  • ns1.ens.fr
  • ns2.ens.fr

and is probably hosted by Renater. See the full list of other websites hosted by Renater.

The highest website ens.fr position in Alexa rank database was 4347 and the lowest rank position was 4760. Current position of ens.fr in Alexa rank database is 4482.

Desktop speed score of ens.fr (100/100) is better than the results of 100% of other sites and shows that the page is performing great on desktop computers.

Mobile usability score of ens.fr (81/100) is better than the results of 25.75% of other sites and means that the page is mobile-friendly.

Mobile speed score of ens.fr (100/100) is better than the results of 100% of other sites and shows that the landing page performance on mobile devices is excellent.

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ens.fr Alexa Rank

The traffic rank is based on three months of aggregated historical traffic data from millions of Alexa Toolbar users and is a combined measure of page views and users.


ens.fr whois

WHOIS gives you the ability to lookup any generic domains to find out the registered domain holder. WHOIS database are provided for information purposes only. It allows the public to check whether a specific domain name is still available or not and to obtain information related to the registration records of existing domain names.


%%
%% This is the AFNIC Whois server.
%%
%% complete date format : YYYY-MM-DDThh:mm:ssZ
%% short date format : DD/MM
%% version : FRNIC-2.5
%%
%% Rights restricted by copyright.
%% See https://www.afnic.fr/en/products-and-services/services/whois/whois-special-notice/
%%
%% Use '-h' option to obtain more information about this service.
%%
%% [167.99.102.248 REQUEST] >> ens.fr
%%
%% RL Net [##########] - RL IP [#########.]
%%

domain: ens.fr
status: ACTIVE
hold: NO
holder-c: ENS8-FRNIC
admin-c: MM28387-FRNIC
tech-c: GRST1-FRNIC
tech-c: JB5174-FRNIC
zone-c: NFC1-FRNIC
nsl-id: NSL8161-FRNIC
registrar: GIP RENATER
Expiry Date: 2021-12-31T23:00:00Z
created: 1994-12-31T23:00:00Z
last-update: 2020-12-31T23:36:36Z
source: FRNIC

ns-list: NSL8161-FRNIC
nserver: ns.ens.fr [129.199.96.11]
nserver: ns1.ens.fr [129.199.98.16]
nserver: ns2.ens.fr [129.199.129.250]
nserver: ext.lri.fr
nserver: ns2.nic.fr
source: FRNIC

registrar: GIP RENATER
type: Isp Option 1
address: Array
address: 75013 PARIS
country: FR
phone: +33 1 53 94 20 30
fax-no: +33 1 53 94 20 31
e-mail: domaine@renater.fr
website: http://www.renater.fr
anonymous: NO
registered: 1998-01-01T12:00:00Z
source: FRNIC

nic-hdl: ENS8-FRNIC
type: ORGANIZATION
contact: ECOLE NORMALE SUPERIEURE
address: Ecole Normale Supérieure
address: 45, rue d'Ulm
address: 75230 Paris
country: FR
phone: +33 1 44 32 30 00
fax-no: +33 1 44 32 20 99
e-mail: direction@ens.fr
registrar: GIP RENATER
changed: 2017-08-22T18:35:27Z nic@nic.fr
anonymous: NO
obsoleted: NO
eligstatus: not identified
reachstatus: not identified
source: FRNIC

nic-hdl: MM28387-FRNIC
type: PERSON
contact: Marc Mezard
address: ECOLE NORMALE SUPERIEURE
address: 45, rue Ulm
address: 75230 Paris CEDEX 5
country: FR
phone: +33 1 44 32 37 96
e-mail: direction@ens.fr
registrar: GIP RENATER
changed: 2017-08-22T18:38:09Z nic@nic.fr
anonymous: NO
obsoleted: NO
eligstatus: ok
eligdate: 2017-08-22T18:38:09Z
reachstatus: not identified
source: FRNIC

nic-hdl: GRST1-FRNIC
type: PERSON
contact: Gip Renater Support Technique Dns
address: GIP RENATER
address: 23-25, rue Daviel
address: 75013 Paris
country: FR
phone: +33 1 53 94 20 40
e-mail: support-dns@renater.fr
registrar: GIP RENATER
changed: 2017-09-05T08:57:15Z nic@nic.fr
anonymous: NO
obsoleted: NO
eligstatus: not identified
reachstatus: not identified
source: FRNIC

nic-hdl: JB5174-FRNIC
type: PERSON
contact: Jacques Beigbeder
address: ENS
address: 45, rue d'Ulm
address: 75230 Paris
country: FR
phone: +33 1 44 32 37 96
fax-no: +33 1 44 32 20 75
e-mail: jacques.beigbeder@ens.fr
registrar: GIP RENATER
changed: 2011-03-18T09:13:42Z nic@nic.fr
anonymous: NO
obsoleted: NO
eligstatus: not identified
reachstatus: not identified
source: FRNIC

ens.fr server information

Servers Location

ens.fr desktop page speed rank

Last tested: 2018-10-08


Desktop Speed Good
100/100

ens.fr Desktop Resource Breakdown

Total Resources1
Number of Hosts1

ens.fr mobile page speed rank

Last tested: 2018-10-08


Mobile Speed Good
100/100

ens.fr Mobile Resource Breakdown

Total Resources1
Number of Hosts1

ens.fr mobile page usability

Last tested: 2018-10-08


Mobile Usability Medium
81/100

ens.fr Mobile Usability Test Quick Summary


priority - 11Use legible font sizes

The following text on your page renders in a way that may be difficult for some of your visitors to read. Use legible font sizes to provide a better user experience.

The following text fragments have a small font size. Increase the font size to make them more legible.

You don't have…n this server. renders only 6 pixels tall (16 CSS pixels).

priority - 10Configure the viewport

Your page does not have a viewport specified. This causes mobile devices to render your page as it would appear on a desktop browser, scaling it down to fit on a mobile screen. Configure a viewport to allow your page to render properly on all devices.

ens.fr HTML validation

Errors

Bad value “revision” for attribute “rel” on element “link”: The string “revision” is not a registered keyword.

Line: 21 Column: 1 - 38
"...ode/2" /> <link rel="revision" href="/node/2" /> ..."

Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)

Line: 82 Column: 5 - 11
"...nvas> <style> @impo..."

Element “style” not allowed as child of element “nav” in this context. (Suppressing further errors from this subtree.)

Line: 122 Column: 9 - 15
"... <style> @impo..." Line: 1646 Column: 9 - 15
"... <style> @impo..."

Attribute “hreflang” not allowed on element “li” at this point.

Line: 243 Column: 25 - 108
"...s="links"><li hreflang="fr" data-drupal-link-system-path="&lt;front&gt;" class="fr is-active"><a hre..." Line: 243 Column: 227 - 300
"...h</a></li><li hreflang="en" data-drupal-link-system-path="&lt;front&gt;" class="en"><a hre..."

An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

Line: 532 Column: 7 - 125
"...e"> <img src="/sites/default/files/styles/image_evenement/public/2020-07/accueil_humanites-globales_une.jpg?itok=imxnU2Bk"> ..."

Stray start tag “a”.

Line: 629 Column: 1 - 60
"...conomie"> <a href="/departement/departement-d-economie" hreflang="fr">Départ..." Line: 632 Column: 1 - 69
"...nitives"> <a href="/departement/departement-d-etudes-cognitives" hreflang="fr">Départ..." Line: 635 Column: 1 - 60
"...istoire"> <a href="/departement/departement-d-histoire" hreflang="fr">Départ..." Line: 638 Column: 1 - 64
"...matique"> <a href="/departement/departement-d-informatique" hreflang="fr">Départ..." Line: 641 Column: 1 - 61
"...iologie"> <a href="/departement/departement-de-biologie" hreflang="fr">Départ..." Line: 644 Column: 1 - 59
"...-chimie"> <a href="/departement/departement-de-chimie" hreflang="fr">Départ..." Line: 647 Column: 1 - 64
"...ciences"> <a href="/departement/departement-de-geosciences" hreflang="fr">Départ..." Line: 650 Column: 1 - 82
"...cations"> <a href="/departement/departement-de-mathematiques-et-applications" hreflang="fr">Départ..." Line: 653 Column: 1 - 64
"...osophie"> <a href="/departement/departement-de-philosophie" hreflang="fr">Départ..." Line: 656 Column: 1 - 61
"...hysique"> <a href="/departement/departement-de-physique" hreflang="fr">Départ..." Line: 659 Column: 1 - 70
"...ociales"> <a href="/departement/departement-de-sciences-sociales" hreflang="fr">Départ..." Line: 662 Column: 1 - 58
"...es-arts"> <a href="/departement/departement-des-arts" hreflang="fr">Départ..." Line: 665 Column: 1 - 77
"...tiquite"> <a href="/departement/departement-des-sciences-de-l-antiquite" hreflang="fr">Départ..." Line: 668 Column: 1 - 75
"...itoires"> <a href="/departement/departement-geographie-et-territoires" hreflang="fr">Départ..." Line: 671 Column: 1 - 73
"...angages"> <a href="/departement/departement-litterature-et-langages" hreflang="fr">Départ..." Line: 674 Column: 1 - 68
"...e-ceres"> <a href="/departement/environnement-et-societe-ceres" hreflang="fr">Enviro..." Line: 677 Column: 1 - 84
"...rs-ecla"> <a href="/departement/espace-des-cultures-et-langues-d-ailleurs-ecla" hreflang="fr">Espace..." Line: 705 Column: 1 - 92
"...t-aoroc"> <a href="/laboratoire/archeologie-et-philologie-d-orient-et-d-occident-aoroc" hreflang="fr">Archéo..." Line: 708 Column: 1 - 113
"...ms-3194"> <a href="/laboratoire/centre-de-recherche-en-ecologie-experimentale-et-predictive-cereep-ums-3194" hreflang="fr">Centre..." Line: 711 Column: 1 - 84
"...mr-7074"> <a href="/laboratoire/centre-de-theorie-et-analyse-du-droit-umr-7074" hreflang="fr">Centre..." Line: 714 Column: 1 - 110
"...-caphes"> <a href="/laboratoire/centre-d-archives-en-philosophie-histoire-et-edition-des-sciences-caphes" hreflang="fr">Centre..." Line: 717 Column: 1 - 64
"...mr-8230"> <a href="/laboratoire/centre-jean-pepin-umr-8230" hreflang="fr">Centre..." Line: 720 Column: 1 - 90
"...antique"> <a href="/laboratoire/centre-leon-robin-de-recherche-sur-la-pensee-antique" hreflang="fr">Centre..." Line: 723 Column: 1 - 62
"...lbwachs"> <a href="/laboratoire/centre-maurice-halbwachs" hreflang="fr">Centre..." Line: 726 Column: 1 - 91
"...epremap"> <a href="/laboratoire/centre-pour-la-recherche-et-ses-applications-cepremap" hreflang="fr">Centre..." Line: 729 Column: 1 - 95
"...mr-8553"> <a href="/laboratoire/departement-de-mathematiques-et-applications-dma-umr-8553" hreflang="fr">Départ..." Line: 732 Column: 1 - 73
"...mr-8548"> <a href="/laboratoire/departement-d-informatique-umr-8548" hreflang="fr">Départ..." Line: 735 Column: 1 - 95
"...ciences"> <a href="/laboratoire/ed-540-ecole-doctorale-transdisciplinaire-lettressciences" hreflang="fr">ED 540..." Line: 738 Column: 1 - 94
"...e-ibens"> <a href="/laboratoire/institut-de-biologie-de-l-ecole-normale-superieure-ibens" hreflang="fr">Instit..." Line: 741 Column: 1 - 81
"...is-imap"> <a href="/laboratoire/institut-des-materiaux-poreux-de-paris-imap" hreflang="fr">Instit..." Line: 744 Column: 1 - 85
"...es-item"> <a href="/laboratoire/institut-des-textes-et-manuscrits-modernes-item" hreflang="fr">Instit..." Line: 747 Column: 1 - 112
"...s-ihpst"> <a href="/laboratoire/institut-d-histoire-et-de-philosophie-des-sciences-et-des-techniques-ihpst" hreflang="fr">Instit..." Line: 750 Column: 1 - 87
"...ne-ihmc"> <a href="/laboratoire/institut-d-histoire-moderne-et-contemporaine-ihmc" hreflang="fr">Instit..." Line: 753 Column: 1 - 66
"...mr-8129"> <a href="/laboratoire/institut-jean-nicod-umr-8129" hreflang="fr">Instit..." Line: 756 Column: 1 - 79
"...mr-8538"> <a href="/laboratoire/laboratoire-de-geologie-de-l-ens-umr-8538" hreflang="fr">Labora..." Line: 759 Column: 1 - 83
"...umr8539"> <a href="/laboratoire/laboratoire-de-meteorologie-dynamique-umr8539" hreflang="fr">Labora..." Line: 762 Column: 1 - 107
"...rm-u960"> <a href="/laboratoire/laboratoire-de-neurosciences-cognitives-computationnelles-inserm-u960" hreflang="fr">Labora..." Line: 765 Column: 1 - 105
"...umr8023"> <a href="/laboratoire/laboratoire-de-physique-de-l-ecole-normale-superieure-lpens-umr8023" hreflang="fr">Labora..." Line: 768 Column: 1 - 103
"...mr-8554"> <a href="/laboratoire/laboratoire-de-sciences-cognitives-et-psycholinguistique-umr-8554" hreflang="fr">Labora..." Line: 771 Column: 1 - 79
"...mr-7203"> <a href="/laboratoire/laboratoire-des-biomolecules-lbm-umr-7203" hreflang="fr">Labora..." Line: 774 Column: 1 - 77
"...ifs-lsp"> <a href="/laboratoire/laboratoire-des-systemes-perceptifs-lsp" hreflang="fr">Labora..." Line: 777 Column: 1 - 74
"...mr-8552"> <a href="/laboratoire/laboratoire-kastler-brossel-umr-8552" hreflang="fr">Labora..." Line: 780 Column: 1 - 108
"...mr-8094"> <a href="/laboratoire/lattice-langues-textes-traitements-informatiques-et-cognition-umr-8094" hreflang="fr">LATTIC..." Line: 783 Column: 1 - 85
"...955-e01"> <a href="/laboratoire/neuropsychologie-interventionnelle-npi-u955-e01" hreflang="fr">NeuroP..." Line: 786 Column: 1 - 81
"...mr-8545"> <a href="/laboratoire/paris-jourdan-sciences-economiques-umr-8545" hreflang="fr">Paris ..." Line: 789 Column: 1 - 95
"...husserl"> <a href="/laboratoire/pays-germaniques-transferts-culturels-et-archives-husserl" hreflang="fr">Pays g..." Line: 792 Column: 1 - 123
"...adiatif"> <a href="/laboratoire/processus-d-activation-selectif-par-transfert-electronique-unimoleculaire-ou-radiatif" hreflang="fr">Proces..." Line: 795 Column: 1 - 98
"...sr-3608"> <a href="/laboratoire/republique-des-savoirs-lettres-sciences-philosophie-usr-3608" hreflang="fr">Républ..." Line: 798 Column: 1 - 109
"...-thalim"> <a href="/laboratoire/theorie-et-histoire-des-arts-et-des-litteratures-de-la-modernite-thalim" hreflang="fr">Théori..." Line: 826 Column: 1 - 125
"...matique"> <a href="/une-recherche-de-pointe/les-bibliotheques-de-l-ens/la-bibliotheque-de-mathematiques-et-informatique" hreflang="fr">La bib..." Line: 829 Column: 1 - 125
"...heque-1"> <a href="/une-recherche-de-pointe/les-ressources-de-la-recherche/les-bibliotheques-de-l-ens/la-bibliotheque-1" hreflang="fr">La bib..." Line: 832 Column: 1 - 125
"...heque-0"> <a href="/une-recherche-de-pointe/les-ressources-de-la-recherche/les-bibliotheques-de-l-ens/la-bibliotheque-0" hreflang="fr">La bib..." Line: 835 Column: 1 - 125
"...heque-3"> <a href="/une-recherche-de-pointe/les-ressources-de-la-recherche/les-bibliotheques-de-l-ens/la-bibliotheque-3" hreflang="fr">La bib..." Line: 838 Column: 1 - 125
"...heque-4"> <a href="/une-recherche-de-pointe/les-ressources-de-la-recherche/les-bibliotheques-de-l-ens/la-bibliotheque-4" hreflang="fr">La bib..." Line: 841 Column: 1 - 125
"...heque-2"> <a href="/une-recherche-de-pointe/les-ressources-de-la-recherche/les-bibliotheques-de-l-ens/la-bibliotheque-2" hreflang="fr">La bib..." Line: 844 Column: 1 - 125
"...heque-d"> <a href="/une-recherche-de-pointe/les-ressources-de-la-recherche/les-bibliotheques-de-l-ens/la-bibliotheque-d" hreflang="fr">La bib..." Line: 847 Column: 1 - 123
"...otheque"> <a href="/une-recherche-de-pointe/les-ressources-de-la-recherche/les-bibliotheques-de-l-ens/la-bibliotheque" hreflang="fr">La bib..." Line: 850 Column: 1 - 117
"...-centre"> <a href="/une-recherche-de-pointe/les-ressources-de-la-recherche/les-bibliotheques-de-l-ens/le-centre" hreflang="fr">Le cen..."

Stray end tag “a”.

Line: 629 Column: 88 - 91
"...9;Économie</a> </opt..." Line: 632 Column: 106 - 109
"...cognitives</a> </opt..." Line: 635 Column: 88 - 91
"...9;Histoire</a> </opt..." Line: 638 Column: 96 - 99
"...formatique</a> </opt..." Line: 641 Column: 85 - 88
"...e Biologie</a> </opt..." Line: 644 Column: 81 - 84
"... de Chimie</a> </opt..." Line: 647 Column: 91 - 94
"...éosciences</a> </opt..." Line: 650 Column: 127 - 130
"...plications</a> </opt..." Line: 653 Column: 91 - 94
"...hilosophie</a> </opt..." Line: 656 Column: 85 - 88
"...e Physique</a> </opt..." Line: 659 Column: 103 - 106
"...s sociales</a> </opt..." Line: 662 Column: 79 - 82
"...t des Arts</a> </opt..." Line: 665 Column: 122 - 125
"...;Antiquité</a> </opt..." Line: 668 Column: 113 - 116
"...erritoires</a> </opt..." Line: 671 Column: 109 - 112
"...t langages</a> </opt..." Line: 674 Column: 101 - 104
"...té (CERES)</a> </opt..." Line: 677 Column: 133 - 136
"...urs (ECLA)</a> </opt..." Line: 705 Column: 159 - 162
"...nt (AOROC)</a> </opt..." Line: 708 Column: 191 - 194
"...(UMS 3194)</a> </opt..." Line: 711 Column: 133 - 136
"...(UMR 7074)</a> </opt..." Line: 714 Column: 184 - 187
"...ces CAPHÉS</a> </opt..." Line: 717 Column: 93 - 96
"...(UMR 8230)</a> </opt..." Line: 720 Column: 143 - 146
"...ée antique</a> </opt..." Line: 723 Column: 87 - 90
"... Halbwachs</a> </opt..." Line: 726 Column: 147 - 150
"...(CEPREMAP)</a> </opt..." Line: 729 Column: 155 - 158
"...(UMR 8553)</a> </opt..." Line: 732 Column: 111 - 114
"...(UMR 8548)</a> </opt..." Line: 735 Column: 156 - 159
"...s/Sciences</a> </opt..." Line: 738 Column: 151 - 154
"...eure IBENS</a> </opt..." Line: 741 Column: 125 - 128
"...Paris IMAP</a> </opt..." Line: 744 Column: 135 - 138
"...nes (ITEM)</a> </opt..." Line: 747 Column: 189 - 192
"...es (IHPST)</a> </opt..." Line: 750 Column: 139 - 142
"...ine (IHMC)</a> </opt..." Line: 753 Column: 97 - 100
"...(UMR 8129)</a> </opt..." Line: 756 Column: 129 - 132
"...(UMR 8538)</a> </opt..." Line: 759 Column: 131 - 134
"... (UMR8539)</a> </opt..." Line: 762 Column: 179 - 182
"...SERM U960)</a> </opt..." Line: 765 Column: 175 - 178
"... (UMR8023)</a> </opt..." Line: 768 Column: 171 - 174
"...(UMR 8554)</a> </opt..." Line: 771 Column: 121 - 124
"...M UMR 7203</a> </opt..." Line: 774 Column: 119 - 122
"...tifs (LSP)</a> </opt..." Line: 777 Column: 113 - 116
"...(UMR 8552)</a> </opt..." Line: 780 Column: 185 - 188
"...(UMR 8094)</a> </opt..." Line: 783 Column: 135 - 138
"...(U955 E01)</a> </opt..." Line: 786 Column: 127 - 130
"...(UMR 8545)</a> </opt..." Line: 789 Column: 153 - 156
"...es Husserl</a> </opt..." Line: 792 Column: 233 - 236
"... UMR 8640)</a> </opt..." Line: 795 Column: 165 - 168
"...(USR 3608)</a> </opt..." Line: 798 Column: 183 - 186
"...é (Thalim)</a> </opt..." Line: 826 Column: 174 - 177
"...formatique</a> </opt..." Line: 829 Column: 162 - 165
"...es Husserl</a> </opt..." Line: 832 Column: 169 - 172
"...rimentales</a> </opt..." Line: 835 Column: 229 - 232
"... (UMR8023)</a> </opt..." Line: 838 Column: 206 - 209
"...on (Risc) </a> </opt..." Line: 841 Column: 173 - 176
"...que-Chimie</a> </opt..." Line: 844 Column: 155 - 158
"...rchéologie</a> </opt..." Line: 847 Column: 154 - 157
"...– Jourdan </a> </opt..." Line: 850 Column: 220 - 223
"... (CAPHÉS) </a> </opt..."

Warnings

The “banner” role is unnecessary for element “header”.

Line: 89 Column: 3 - 39
"...home"> <header role="banner" class="header"> <..."

The “navigation” role is unnecessary for element “nav”.

Line: 117 Column: 1 - 105
"... </div> <nav role="navigation" aria-labelledby="block-navigationprincipale-menu" id="block-navigationprincipale"> ..." Line: 260 Column: 1 - 103
"... </div> <nav role="navigation" aria-labelledby="block-mainandfootermenu-2-menu" id="block-mainandfootermenu-2"> ..." Line: 1262 Column: 5 - 107
"...<div> <nav role="navigation" aria-labelledby="block-mainandfootermenu-4-menu" id="block-mainandfootermenu-4"> ..." Line: 1500 Column: 1 - 103
"... </div> <nav role="navigation" aria-labelledby="block-mainandfootermenu-3-menu" id="block-mainandfootermenu-3"> ..." Line: 1641 Column: 1 - 85
"... </nav> <nav role="navigation" aria-labelledby="block-pieddepage-menu" id="block-pieddepage"> ..."

The “charset” attribute on the “script” element is obsolete.

Line: 459 Column: 178 - 247
"...ULM"></a> <script async src="//platform.twitter.com/widgets.js" charset="utf-8"></scri..."

The “main” role is unnecessary for element “main”.

Line: 465 Column: 3 - 45
"...v> <main role="main" class="main-content-div"> <..."

Empty heading.

Line: 1250 Column: 8 - 11
"..."> <h6></h6> ..."

The “contentinfo” role is unnecessary for element “footer”.

Line: 1427 Column: 7 - 48
"...> <footer role="contentinfo" class="footer"> ..."

The “type” attribute is unnecessary for JavaScript resources.

Line: 1673 Column: 3 - 33
"... </div> <script type="text/javascript"> va..." Line: 1683 Column: 1 - 31
"...Piwik --> <script type="text/javascript"> var..."

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ens.fr Ping

Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network. It measures the round-trip time for messages sent from the originating host to a destination computer that are echoed back to the source.


ens.fr TRACEROUTE

Traceroute is a computer network diagnostic tool for displaying the route (path) and measuring transit delays of packets across an Internet Protocol (IP) network. The history of the route is recorded as the round-trip times of the packets received from each successive host (remote node) in the route (path); the sum of the mean times in each hop is a measure of the total time spent to establish the connection. Traceroute proceeds unless all (three) sent packets are lost more than twice, then the connection is lost and the route cannot be evaluated.