reverse lookup example
Mark_Andrews at isc.org
Fri Feb 24 21:05:26 UTC 2006
> The following is a sample SOA record. The subnet mask
> for this example would be 255.255.255.128. My
> question is what does the 0/24 portion of the
> configuration suppose to represent? Thank you in
Well it would normally be 0/25.
<first octet in range>/<one bits in netmask>.
It's just a way of generating a label different from 0.
Alteratives are 0-127, <first octet in range>-<last octet in range>.
Just plain 0, but people get confused when that see 5 octets.
It really doesn't matter what it is as log as the CNAME
which map from the well known name to the new names exist.
> 0/18.104.22.168.in-addr.arpa. IN SOA host.domain.com.
> root.host.domain.com. (
> 2005112801 ; Serial
> 7200 ; Refresh after 3 hours
> 3600 ; Retry after 1 hour
> 604800 ; Expire after 1 week
> 172800 ) ; Minimum TTL of 2 days
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Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org
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