The root hints file , also called the cache hints file , contains host information that is needed to resolve names outside of the authoritative DNS domains. It contains the names and addresses of root DNS servers.
The authoritative name servers that serve the DNS root zone, commonly known as the “root servers”, are a network of hundreds of servers in many countries around the world. They are configured in the DNS root zone as 13 named authorities, as follows.
List of Root Servers
|a.root-servers.net||22.214.171.124, 2001:503:ba3e::2:30||VeriSign, Inc.|
|b.root-servers.net||126.96.36.199, 2001:500:84::b||University of Southern California (ISI)|
|c.root-servers.net||188.8.131.52, 2001:500:2::c||Cogent Communications|
|d.root-servers.net||184.108.40.206, 2001:500:2d::d||University of Maryland|
|e.root-servers.net||220.127.116.11||NASA (Ames Research Center)|
|f.root-servers.net||18.104.22.168, 2001:500:2f::f||Internet Systems Consortium, Inc.|
|g.root-servers.net||22.214.171.124||US Department of Defense (NIC)|
|h.root-servers.net||126.96.36.199, 2001:500:1::53||US Army (Research Lab)|
|j.root-servers.net||188.8.131.52, 2001:503:c27::2:30||VeriSign, Inc.|
|k.root-servers.net||184.108.40.206, 2001:7fd::1||RIPE NCC|
|m.root-servers.net||220.127.116.11, 2001:dc3::35||WIDE Project|