Web-based ping, traceroute and DNS lookup

Today I ran across three useful online tools to do a quick test from multiple locations worldwide of ping, traceroute and DNS lookup.

• just-ping.com - Online web-based ping: remote ping a server or web site using our network with 40 checkpoints worldwide.
• just-traceroute.com - Online traceroute from 4 locations worldwide.
• just-dnslookup.com - Remote DNS lookup (nslookup/dig) from 30+ locations worldwide.