A while ago, dnsstuff.org, the site I used to check everything related to DNS got off the freeware market and they started a paid service, which, no doubt is good, please pay for it if you still want to use them, but I want to give you a few alternatives.
The ones who want more than this, can use dnsutils.org, which allows users to do the following:
- Reverse DNS
- Ping Host/IP
- FQDN based DNS Lookup (A, AAA, SOA, CNAME, NS, MX)
- CIDR Calculator
- IPV6 Compression
- IPV6 Expansion
- RBL Lookup
- transform IPv4 into binary and back
- transform IPv6 into bin and back
Quite a good service offered by Jonas Genannt <jonas (AT) dnsutils (DOT) org>.