From Paul:

All of the servers listed as authorative for comms.net show the correct
address:

empeg.comms.net has address 66.219.41.221
empeg.comms.net has address 66.219.41.221
empeg.comms.net has address 66.219.41.221
empeg.comms.net has address 66.219.41.221
empeg.comms.net has address 66.219.41.221

However this tool shows some servers have a cached address:

http://www.dnsstuff.com/tools/ispdns.ch?name=empeg.comms.net&type=A

Which is strange because the TTL is set to a day so should have timed out by
now. The only problem I could see is one of the authorative servers is
currently down.

Cheers

Paul