Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I can successfully ping but it will not return a host name. Why not ?

share|improve this question
up vote 8 down vote accepted

In order for reverse DNS lookups to succeed, there needs to be a valid PTR record for the IP in question. In this case, there is no PTR record.

share|improve this answer
Has the city of Bjarred bought this IP and can therefore modify parameters that you would not normally be able to if you have a dynamic IP ? – bobby Oct 16 '10 at 20:29
Whois information has the city listed as the assignee of this netblock. So yes, typically in this situation, they have full control over the netblock as well as any reverse DNS entries for the zone. Whether or not they "bought" the netblock or were given it to use by their ISP, we can't really know. – EEAA Oct 16 '10 at 20:50
@bobby: If you really want to know then give Jonas Bjorkander a call. – Iain Oct 16 '10 at 20:59

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.