A freeware program designed to query DNS for the ENUM NAPTR mapping between a telephone number and a SIP, H323, IAX2 or other URI. Use with VOIP systems to check your e.164 or freenum or other mappings. This program queries each DNS assigned to your system (or specifc user defined DNS) using the e164.arpa or other root tree for the corresponding NAPTR records and displays them. Requires Windows 2008, 2003, Vista, XP, or 2000.