DNS: Root Server

A root name server is a name server for the Domain Name System's root zone. It directly answers requests for records in the root zone and answers other requests by returning a list of the authoritative name servers for the appropriate top-level domain (TLD). The public root name servers are a critical part of the Internet infrastructure because they are the first step in translating (resolving) human readable host names into IP addresses that are used in communication between Internet hosts.

A combination of limits in the DNS and certain protocols, namely the practical size of unfragmented User Datagram Protocol (UDP) packets, resulted in a decision to limit the number of root servers to 13 logical servers. To serve the needs of the public Internet worldwide, the number of root server instances is 376 as of 22 August 2013.

Hostname 	IP Addresses 	Manager
a.root-servers.net 	198.41.0.4, 2001:503:ba3e::2:30 	VeriSign, Inc.
b.root-servers.net 	192.228.79.201 	University of Southern California (ISI)
c.root-servers.net 	192.33.4.12 	Cogent Communications
d.root-servers.net 	199.7.91.13, 2001:500:2d::d 	University of Maryland
e.root-servers.net 	192.203.230.10 	NASA (Ames Research Center)
f.root-servers.net 	192.5.5.241, 2001:500:2f::f 	Internet Systems Consortium, Inc.
g.root-servers.net 	192.112.36.4 	US Department of Defence (NIC)
h.root-servers.net 	128.63.2.53, 2001:500:1::803f:235 	US Army (Research Lab)
i.root-servers.net 	192.36.148.17, 2001:7fe::53 	Netnod
j.root-servers.net 	192.58.128.30, 2001:503:c27::2:30 	VeriSign, Inc.
k.root-servers.net 	193.0.14.129, 2001:7fd::1 	RIPE NCC
l.root-servers.net 	199.7.83.42, 2001:500:3::42 	ICANN
m.root-servers.net 	202.12.27.33, 2001:dc3::35 	WIDE Project

Referensi

• http://en.wikipedia.org/wiki/Root_name_server
• http://www.root-servers.org/
• http://www.iana.org/domains/root/servers