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Upon Certification with SMS/800, new Responsible Organizations (Resp Orgs) are assigned 2 test numbers from each of the active 8XX NPA’s (currently 888, 877, 866, and 800). Per SMS/800, the range of numbers reserved for this purpose is 8XX-250-0000 through 8XX-250-1499.

These numbers are listed in the welcome package sent by SMS/800 representatives to each new Resp Org. Test numbers are kept in an Unavailable status, so if any 250 NXX is inadvertently spared, it will never go into the spare pool.

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