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Created by Cui Hao (cuihao)@cuihao.leo

dig treats -4/-6/-m after -q argument as an option but not a domain name

Summary

According to man dig, the argument after -q should always be treated as domain name:

-q name
    The domain name to query. This is useful to distinguish the name
    from other arguments.

However, I noticed that if name starts with -4, -6 or -m, it will be treated as arguments, like this:

$ dig -q -64
dig: only one of -4 and -6 allowed

While other hyphen-starting name works well (I manually add A record for -test on our DNS server):

$ dig +short -q -test
1.2.3.4

(Domain name starting with hyphen is not legal in RFC1034. But most DNS server/client softwares indeed support it.)

BIND version used

$ dig -v
DiG 9.13.3