dnsguide

I made one too https://github.com/ccouzens/dns-packet The differences: I followed this guide rather than the RFCs https://github.com/EmilHernvall/dnsguide/blob/master/chapter... Mine isn't as polished. The command line parsing and output is more thrown together. I hardcoded the packet identifier (it's not production code, and I'm only looking up one at a time). I didn't use any bit manipulation libraries. I can see they would help because DNS packets don't line up their information with the byte boundaries.

If you are curious about the low level details of DNS, you might want to check out an article I wrote about how to build a DNS server from first principles: https://github.com/EmilHernvall/dnsguide