Networking

Links

Traceroute, Looking Glass and Route Servers
Reverse Traceroute and Looking Glass Servers

IANA Root-Zone Whois Index by TLD Code

robtex swiss army knife internet tool

IPv6

Hurricane Electric IPv6 Tunnel Broker

SixXS IPv6 deployment

Official 6bone Webserver List

Sixy - directory of IPv6 enabled web sites

DNS

DNSCheck - check the DNS setup of a domain.

DNSInspect - check the DNS setup of a domain.

DNS Bajaj - check the delegation of a domain.

Email

Interactive DNS MX-verify - check the MX servers of a domain.

Sender Policy Framework

Designated Mailers Protocol

Cisco

Command Lookup Tool (login required)
Feature Navigatior
Cisco Notification Service (login required)

Undocumented Cisco Commands

Cisco and Juniper Password Cracker
Decode Password 7 Hash in a Cisco IOS Router

Juniper

Juniper Clue

Cisco and Juniper Password Cracker

WLAN

Wireless Geographic Logging Engine

NodeDB

FreeNetworks.org

Linux Wireless
hostapd - Linux IEEE 802.11 AP and IEEE 802.1X authenticator
MadWifi project - Linux kernel drivers for Atheros based WLAN devices

Germany

mobileaccess.de

freifunk.net

WarDriving-Forum.de

elho.net

Proxy autoconfiguration URL for the local elho.net network:
http://www.elho.net/proxy.pac