IANA's Port Numbers
IANA's Protocol Numbers
IANA's country code info
OIDview MIB page
mibdepot.com
Robtex ASN Info for AS 36149
Number Resource Organization T1 Timing
Rob Thomas'DNS Root Name Server Query Response
Inter-planetary Internet Project

International Computer Science Institute (ICSI) of UC Berkley has the ICSI Center for Internet Research (ICIR)
Arin's currently administered IP blocks
Arin's FTP site for current ASN allocations
cidr-report's ASN list
International Telecommunication Union's   newsroom   news magazine

UH MRTG graphs
Sprint's Naming Conventions
AT&T's status page
Qwest's IP Network Statistics


Internet Traffic Report
The Internet Health Report

National Communications System of the Department of Defense
Internet Architecture Board (IAB)
ICANN - The Internet Corporation for Assigned Names and Numbers
Electronic Privacy Information Center's   Critical Infrastructure Protection
US Computer Emergency Readiness Team
The Network Reliability and Interoperability Council
Organization for Internet Saftey
cisco Security Advisories

tools:
LFT: Layer Four Traceroute
tracetcp - tcptraceroute for windows
NPAD - Diagnostic Server
NDT - Network Diagnostic Tool
BGPlay
Netmeter for *nix
Stanford Linear Accelerator Center's Network Monitoring Tools
Pathrate and pathload
and Interesting Web Sites for Internet Monitoring
CAIDA's Internet Tools
NLANR - National Laboratory for Applied Network Research has Network Performance and Measurement Tools
Berkeley's International Computer Science Institute (ICSI) has a research arm called: ICSI Center for Internet Research (ICIR). This is their Tools for Bandwidth Estimation page.
gNetcat
Ettercap
FlowScan
FlowScan tools/Help
cFlowd
Netflow Sensor
NFDUMP
FixedOrbit
AS Path Visulazation
GASP
TCPtraceroute
Carnegie Mellon's Network Registration system (NetReg) and the Network Monitoring (NetMon) systems
Packet Storm Secuitity
The Hacker's Choice
Netdisco network monitoring
Graphviz - open source graph drawing software

Pathchirp
Fake Traceroute
iperf - a tool to measure maximum TCP bandwidth
Nagios - network monitoring
The Netlantis Project
Intermapper - network monitoring software
TCPView
NTop
HPing
packit
cisecurity's scanning tool
IPAudit
H.323 Beacon
fProbe
NProbe from NTop - tool for generating v5/v9 flows
Foundstone's Forensic Toolkit v2.0
Netmeter
objdump displays information about object files
OpenNMS
Big Sister

TCPreplay
Netdude
Kismet Wireless detector/sniffer/IDS
OpenVPN
Argus
WinSockFix
nbtstat for Linux
Center for Internet Security
networks:
Canarie: "Canada's Research and Innovation Network"