User Agent String.Com 

User Agent String explained :

ia_archiver 8.0
ia_archiver	Name : ia_archiver
8.0	ia_archiver version
Windows 2.4	Operating System:
en-US	Language Tag, indicates the language for which the client had been localized (e.g. menus and buttons in the user interface) en-US = English - United States
Description:	Alexa Web crawler
First visit:	2011.01.05 04:16
Last visit:	2018.07.29 07:59
IP address and host name	114.255.40.48 - 114.255.40.48 151.80.238.152 - 151.80.238.152 162.247.72.217 - perry.fellwock.tor-exit.calyxinstitute.org 185.143.240.43 - vserver-tor2.cornelissen-weening.eu 192.42.116.16 - tor-exit.hartvoorinternetvrijheid.nl 212.47.253.151 - dylan.exit.torworld.org 217.115.10.132 - tor2.anonymizer.ccc.de 46.166.148.154 - 46.166.148.154 51.15.55.140 - 140-55-15-51.rev.cloud.scaleway.com 51.15.65.25 - zcashtor2nl.zcashtorservers.org 62.141.55.117 - ns2.tor-exit.keyweb.de.daknob.net 62.210.81.52 - s89-paris.cloud-center.ro 79.133.62.34 - backend01.sixhop.net 92.27.26.29 - host-92-27-26-29.static.as13285.net
All ia_archiver user agent strings