10alogo.co.uk

Base64-encoded internal mail subdomain in DNS for no reason

$ dig TXT 10alogo.co.uk

;; QUESTION SECTION:

;10alogo.co.uk. IN TXT

;; ANSWER SECTION:

10alogo.co.uk. 3600 IN TXT "MAltYWlsLjEwYWxvZ28uY28udWsuCg=="

What Happened

The TXT record `MAltYWlsLjEwYWxvZ28uY28udWsuCg==` decodes from Base64 to `1-mail.10alogo.co.uk. `. A broken programmatic DNS update script Base64-encoded an internal mail subdomain and pushed it as a raw TXT value instead of parsing it as plain text. The subdomain is now globally visible encoded in Base64 in the zone file.

Full TXT Record Value

MAltYWlsLjEwYWxvZ28uY28udWsuCg==