NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days — NPA 405
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 1
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 405-216 1XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 EDMOND OK
— 405-217 0XXX3XXX4XXX5XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-218 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-219 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-220 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - OK 6272 SEMINOLE OK
— 405-221 8XXX9XXX which blocks → UNITED STATES CELLULAR - OK 6272 HOLDENVL OK
— 405-222 none assigned yet which blocks → SOUTHWESTERN BELL 9533 CHICKASHA OK
— 405-224 not yet reported which blocks → SOUTHWESTERN BELL 9533 CHICKASHA OK
— 405-227 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OKLA CITY OK
— 405-228 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-230 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-231 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-232 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-233 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J ARCADIA OK
— 405-234 0XXX1XXX6XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-235 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-236 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-237 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 MOORE OK
— 405-238 none assigned yet which blocks → SOUTHWESTERN BELL 9533 PAULS VLY OK
— 405-239 0XXX4XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-240 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 CHANDLER OK
— 405-241 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA OK - LLC 530C BRITTON OK
— 405-243 0–9 XXXall 10 · 2 holders which blocks → UNITED STATES CELLULAR - OK 6272 OKLA CITY OK
— 405-245 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 OKLA CITY OK
— 405-246 0XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA OK - LLC 530C OKLA CITY OK
— 405-247 0XXX which blocks → SOUTHWESTERN BELL 9533 ANADARKO OK
— 405-248 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA OK - LLC 530C OKLA CITY OK
— 405-250 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OKLA CITY OK
— 405-251 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → UNITED STATES CELLULAR - OK 6272 WYNNEWOOD OK
— 405-253 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA OK - LLC 530C NORMAN OK
— 405-254 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK 7258 BRITTON OK
— 405-256 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J MUSTANG OK
— 405-257 0XXX4XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 WEWOKA OK
— 405-258 none assigned yet which blocks → SOUTHWESTERN BELL 9533 CHANDLER OK
— 405-259 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J NICOMAPARK OK
— 405-260 2XXX5XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 GUTHRIE OK
— 405-261 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J WHEATLAND OK
— 405-262 not yet reported which blocks → SOUTHWESTERN BELL 9533 EL RENO OK
— 405-263 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 OKARCHE OK
— 405-264 3XXX6XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-265 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J YUKON OK
— 405-266 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OK 409F WANETTE OK
— 405-267 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F BYARS OK
— 405-268 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PAULS VLY OK
— 405-269 0XXX5XXX7XXX which blocks → T-MOBILE USA, INC. 6529 STILLWATER OK
— 405-270 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-271 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-272 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-273 not yet reported which blocks → SOUTHWESTERN BELL 9533 SHAWNEE OK
— 405-274 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CHICKASHA OK

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.