diff <(sort -u <(dig +nottlid +noall +answer @10.0.0.10 example.com TXT -t axfr) ) <(sort -u <(dig +nottlid +noall +answer @10.0.0.11 example.com TXT -t axfr) )
Works in bash
Query txt records with nslookup:
set q=txt c3po._domainkey.altn.com