Request for Comments (RFC's) Net Standards

Internet Encyclopedia (RFC's, Design, FAQs)

Internet Engineering Task Force (IETF) - RFC Lookup

InterNIC Registration Services - Domains (.com,...)

Search IEEE OUI and Company Assignments

SEC Filings & Forms (EDGAR) - US public companies

American Registry for Internet Numbers (ARIN)

Asia Pacific Network Information Centre (APNIC)

Latin American and Caribbean Address Registry (LACNIC)

Africa Address Registry (AFRINIC)

RIPE NCC Network Coordination Centre (RIPE)

Registration lookup - MarkMonitor

Universal "WHO IS" - 246 countries

Looking Glass for Public NAPs (MAE East/West) & Web Tools

DNS Stuff: DNS Tools, traceroute, WHOIS

DNS Query Web Tool - NSLOOKUP

Looking Glass, Route Servers, and BGP Info

Remote DNS look up via an Internet web-server

Internet IP tools - lookup domain, traceing, ping ...

Port Detective - what ports are available on YOUR PC

Internet accessible tool "Shields UP!" probes target IP / ports

Unicode character code charts in PDF format

List of Well Known and Registered Ports (1 through 49151)

Special Application IP Ports

Fiber and facilities locator service

Routing Protocols (OSPF, BGP) - GateD, Public Software

Cisco BGP configurator tools

Report a site's OS, web server, and netblock owner

NAP Internet resources

Test / List Internet directed broadcast routers - Amplifiers

VeriSign, issues SSL - via Certification Authority (CA)

Thawte, issues SSL - via Certification Authority (CA)