underscore in A or PTR records

[ONRUBIA AVILES Carlos (CCS/MST)]

Hello ,

I face the following problem  ==> bind do not accept an A record with underscore:

Example:     example_try   A    1.2.3.4


Same for a PTR:

Example:   1.2.3.4   PTR   example_try


Is it absolutely forbidden to have in such cases an '_'?
I know that it is possible for SRV or TXT records.


Thanks in advance to clarify the situation and sorry if this question has already be asked.

Carlos,



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