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
— 405-494 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J YUKON OK
— 405-495 not yet reported which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-498 2XXX3XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-499 not yet reported which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-502 not yet reported which blocks → SPOK, INC. 6630 OKLA CITY OK
— 405-503 2XXX which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-506 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK 7258 BETHANY OK
— 405-507 9XXX which blocks → ONVOY, LLC - OK 409F BRITTON OK
— 405-509 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J EDMOND OK
— 405-510 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J OKLA CITY OK
— 405-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 405-513 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J EDMOND OK
— 405-514 2XXX which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-516 1XXX8XXX9XXX which blocks → ONVOY, LLC - OK 409F OKLA CITY OK
— 405-518 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J WHEATLAND OK
— 405-520 none assigned yet which blocks → T-MOBILE USA, INC. 6529 OKLA CITY OK
— 405-521 7XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-522 not yet reported which blocks → COMCAST IP PHONE, LLC 318J OKLA CITY OK
— 405-523 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-524 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-525 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-526 0XXX3XXX9XXX · 2 holders which blocks → ONVOY, LLC - OK 409F OKLA CITY OK
— 405-527 not yet reported which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 PURCELL OK
— 405-528 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-529 3XXX4XXX5XXX6XXX · 3 holders which blocks → ONVOY, LLC - OK 409F BRITTON OK
— 405-530 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-533 not yet reported which blocks → CHICKASAW TELECOMMUNICAIONS SERVICES, INC. 4630 STILLWATER OK
— 405-536 0XXX1XXX4XXX5XXX which blocks → ONVOY, LLC - OK 409F OKLA CITY OK
— 405-539 not yet reported which blocks → PAGE PLUS, INC. 9671 OKLA CITY OK
— 405-542 none assigned yet which blocks → HINTON TEL. CO. OF HINTON OK, INC. 1995 HINTON OK
— 405-543 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 OKLA CITY OK
— 405-547 0XXX3XXX4XXX6XXX7XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 PERKINS OK
— 405-548 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → NUSO, LLC 732J OKLA CITY OK
— 405-549 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OKLA CITY OK
— 405-550 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OKLA CITY OK
— 405-551 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-552 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-553 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST OK
— 405-556 0XXX1XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-557 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-558 1XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-559 not yet reported which blocks → SPOK, INC. 6630 OKLA CITY OK
— 405-560 not yet reported which blocks → PAGE PLUS, INC. 9671 OKLA CITY OK
— 405-562 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J EDMOND OK
— 405-564 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CSC VOICE, LLC 612K STILLWATER OK
— 405-567 5XXX which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 PRAGUE OK
— 405-570 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OKLA CITY OK
— 405-571 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 STILLWATER OK
— 405-572 not yet reported which blocks → 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.