Arul John and SearchBug produce results for VoIP phone numbers on their websites. Both of these services also identify location and carrier information in the results.
Arul John's telephone search provides the registered name and address of any telephone number in the United States, including VoIP phone numbers. Results from the search also include the type of telephone attributed to the line. The website also tracks IP addresses, wireless network keys and email addresses.
SearchBug's website identifies landline, cellular and VoIP telephone numbers from the United States and Canada. Other services on the site include reverse lookup, email and IP address searches. There is a daily limit of five searches through SearchBug.