What is my IP? - Find out what your IP is. Do not hesitate to open wimip.
HostedScan.com - Online vulnerability scanner for servers, networks, and web applications.
GRC Port Scan - GRC Internet Security Port Scanner. Tests for open ports on your external IP address.
HackerTarget.com - Security Vulnerability Scanning based on Open Source Tools.
geoiplookup.net - (IPv4 only) Online tool to get accurate IP address information
Acunetix - Audit your website security and web applications for SQL injection, Cross site scripting and other...