UptimeRobot - Free Website Uptime Monitoring
Gestioip - GestióIP is an automated, Web based IP address management (IPAM) software.
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
BloxOne™ DDI - BloxOne™ DDI, a cloud-managed DDI that is proposed for remote branch offices, provides them with an automated approach to control DNS, DHCP, and IP address management for modern networking.
Pingometer - Pingometer is a service that monitors the uptime, downtime, and performance of websites. Get 24/7 monitoring - sign up for your FREE account today!
SolarWinds IP Address Tracker - SolarWinds IP Address Tracker software, an all-in-one network monitoring utility, provides you with all the visibility you need into what’s connected to your network.