origin: example.com.
default_class: CH
zonefile: |
  classless     3600      TXT  \# 4 03 66 6f 6f
  ch            3600  CH  A    192.168.0.1
  defaultclass  3600      A    192.168.0.2
result:
  - owner: classless.example.com.
    class: CH
    ttl: 3600
    data: !Unknown
      rtype: Txt
      data: 03666f6f
  - owner: ch.example.com.
    class: CH
    ttl: 3600
    data: !A
      addr: 192.168.0.1
  - owner: defaultclass.example.com.
    class: CH
    ttl: 3600
    data: !A
      addr: 192.168.0.2