Checkout Cisconet.com

Check this site cisconet.com
You will find following stuff on this site
Route server
World NOC list
Tips about BGP
a.BGP path selection
b.BGP attribution
c.BGP regular expression
d.BGP ASN list
e.BGP community list
f.BGP commands
g.BGP rfc
h.BGP sample config

Whois database
North America-ARIN
Asia-APNIC
Europe-RIPE
South America -LATIN
African-AFRINIC


DNS server list in America

TCP/IP
CIDR table
TCP ports
TCP throughput