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Host is a very powerful DNS query and testing command-line tool.
Major differences with the ancient version of the program with the same
name that's included in the BIND-4 and BIND-8 distributions:
- Major overhaul of the entire code.
- Very rigid error checking, with more verbose error messages.
- Zone listing section completely rewritten.
- It is now possible to do recursive listings into delegated zones.
- Maintain resource record statistics during zone listings.
- Maintain count of hosts during zone listings.
- Check for various extraneous conditions during zone listings.
- Check for illegal domain names containing invalid characters.
- Verify that certain domain names represent canonical host names.
- Perform ttl consistency checking during zone listings.
- Exploit multiple server addresses if available.
- Option to exploit only primary server for zone transfers.
- Option to exclude info from names that do not reside in a zone.
- Implement timeout handling during connect and read.
- Write resource record output to optional log file.
- Special MB tracing by recursively expanding MR and MG records.
- Special mode to check SOA records at each nameserver for a zone.
- Special mode to check reverse mappings of host addresses.
- Extended syntax allows multiple arguments on command line or stdin.
- Configurable default options in HOST_DEFAULTS environment variable.
- Implement new resource record types from RFC 1183 and 1348.
- Basic experimental NSAP support as defined in RFC 1637.
- Implement new resource record types from RFC 1664 and 1712.
- Implement new resource record types from RFC 1876 and 1886.
- Code is extensively documented.
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