EveryDNS.net: Free, reliable DNS
EveryDNS.net was founded by the same person who founded OpenDNS. EveryDNS provides both static and dynamic DNS services for your TLD. I’ve found that’s it’s really hard to find good DNS services for free. My registrar, 1&1 provides free DNS service for any domain you register. However, it’s very limited in nature. You can only have only have a limited number of records such as one A record. 1&1 does not offer dynamic DNS services.
EveryDNS has both static and dynamic DNS services. You can manage up to 25 zones with them and up to 200 records for free. For a small payment of $15, you can have as many zones and records as you want. EveryDNS is very reliable. They’ve been around forever, and they’ve had pretty much 100% uptime. For free, what more could you want.
I’ll also plug 1&1. 1&1 is one of the cheapest registrars. They’re not particularly fast, but once you register the domain and port the DNS to EveryDNS, who cares how fast they are.