INTERNET ROOT SERVERS !!

The root servers are the pillars of the internet.
There are 13 root servers around the world and they are responsible for the working of the internet.
If all 13 go offline, Internet will be dead (perhaps not immediately).
These servers maintain all the data about all the websites on the internet.
As per a stat, the .COM list of websites in 2002 is a 2 GB file that was on one of the root servers.
All the DNS servers get their data from these root servers and cache them.

The root servers are named from A to M.
Here are some stats abt them,

Server	Operator	IP Addr
A	VeriSign Naming and Directory Services	198.41.0.4
B	Information Sciences Institute	IPv4: 192.228.79.201 IPv6: 2001:478:65::53
C	Cogent Communications	192.33.4.12
D	University of Maryland	128.8.10.90
E	NASA Ames Research Center	192.203.230.10
F	Internet Systems Consortium, Inc.	IPv4: 192.5.5.241 IPv6: 2001:500::1035
G	U.S. DOD Network Information Center	192.112.36.4
H	U.S. Army Research Lab	IPv4: 128.63.2.53 IPv6: 2001:500:1::803f:235
I	Autonomica/NORDUnet	192.36.148.17
J	VeriSign Naming and Directory Services	192.58.128.30
K	Reseaux IP Europeens - Network Coordination Centre	IPv4: 193.0.14.129 IPv6: 2001:7fd::1
L	Internet Corporation for Assigned Names and Numbers	198.32.64.12
M	WIDE Project	202.12.27.33 IPv6: 2001:dc3::35

More info abt root servers can be found here,
http://www.root-servers.org/