IP adress issue

[Guy Betten]

I like to see who is viewing my forum and sometimes get a IP address that disappears when you click it to view the ISP. I just had one that shows as 66.90.73.90 & when I click it to see who the ISP is it goes to a . as in a period. I have never seen this. Any ideas? Thanks in advance, JPT

[Lynne]

Probably because it doesn't resolve. Look it up on network-tools and you get this:
IP address: 66.90.73.90
No host name is associated with this IP address or no reverse lookup is configured.
66.90.73.90 is from United States(US) in region North America

[Guy Betten]

So when you mean it does not resolve, what does that mean please? I am new to this end of admin, JPT.

[Lynne]

I mean that there the IP does not map out to a particular host name - so you can't say "oh, this IP belongs to AOL" or similar. The host has not 'registered' the IP, I guess (or they have other reasons for not wanting people to know who it is?). Sorry I can't be of more help there, but it's not really anything I've ever really looked into before.