Network Lookups may be blocked by the various registries. The direct links for ip address network lookups are:
Americas (ARIN) | Europe (RIPE) | Asia-Pacific (APNIC) | Africa (AfriNIC) | Latin American and Caribbean (LACNIC) | Asia-Pacific (APNIC) | Korea (KRNIC)
Free online network tools : Including Traceroute, DNS Records, HTTP Headers, NsLookup, Whois, Ping, and our own Domain Dossier and Email Dossier.
http://www.wppersian.com?type=lookupLookup failed: www.wppersian.com?type=lookup Host not found