Finding authoritative server and last update

[Jeremy C. Reed]

On Tue, 3 Feb 2015, Robert Moskowitz wrote:

> I am trying to find out which comcast server is authoritative for
> 
> 4.254.253.50.in-addr.arpa
> 
> and when the zone file for the ptr rr was last updated.
> 
> I was told a week ago that the ptr would be updated, but I am still 
> not seeing any change...
> 
> I am not really good at keeping good notes on using dig.

Have a look at output from:

dig +trace 4.254.253.50.in-addr.arpa PTR

dig 254.253.50.in-addr.arpa SOA