Each Resp Org company, upon Resp Org establishment, is issued 2 permanent test Toll-Free Numbers per Entity for each 8XX Numbering Plan Area (NPA) in the range of 8XX-250-0000 through 8XX-250-1499. Resp Orgs may use the numbers only for network testing and troubleshooting purposes. Assignment of the test numbers to subscribers is inappropriate and could result in customer disruption as the guidelines for the assignment of test numbers may change.
As new Toll-Free NPAs are opened 2 additional test numbers are assigned to each Resp Org for the new NPA. The assignment for the additional new test numbers is determined through a comparison of existing test number assignments and active Resp Org companies. New NPA test numbers are assigned so that the line numbers are consistent throughout all NPAs. An example would be Resp Org Company XXX01 being assigned 800-250-0000, 888-250-0000, 877-250-0000, 866-250-0000, etc. as its test numbers.
After all new test numbers have been assigned, comparisons of the controlling (current) Resp Org company list with the list of assigned test numbers (this list is now a combination of new test numbers and previously existing test numbers) are again performed to ensure that each Resp Org company has been designated the appropriate number of test numbers and that the line numbers are consistent throughout the NPAs. As new test numbers are assigned, letters are distributed to the Primary Contacts for each Resp Org notifying them of the availability of the new test numbers as well as identifying the line numbers under their Resp Org’s control.
Test numbers have a Number Administration status of "Unavailable". A report titled "Unavailable Numbers Report" provides a means for each Resp Org to view the test numbers assigned to their company and it may be viewed or downloaded. It can be accessed by logging into the TFNRegistry™ (tfnregistry.somos.com) and then selecting the "TFN Registry Reporting" menu item. If this menu item is not available, please contact your Resp Org's Primary Contact and/or Company Administrator(s) to obtain Reporting permissions.