NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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, all time — NPA 918
SOUTHWESTERN BELL 236
NEW CINGULAR WIRELESS PCS, LLC - IL 93
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 50
T-MOBILE USA, INC. 49
VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 36
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
— 918-543 5XXX9XXX · 2 holders which blocks → OKLAHOMA COMMUNICATION SYSTEM, INC. 1984 INOLA OK
— 918-544 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 MIAMI OK
— 918-545 not yet reported which blocks → TOTAH COMMUNICATIONS, INC. 2030 OGLESBY OK
— 918-546 not yet reported which blocks → CHEROKEE TEL. CO. 1979 STUART OK
— 918-547 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
— 918-548 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 SAVANNA OK
— 918-549 0XXX1XXX5XXX8XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-551 1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-552 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 STIGLER OK
— 918-554 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → PEERLESS NETWORK OF OKLAHOMA, LLC - OK 384H BRAGGS OK
— 918-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST OK
— 918-556 0XXX1XXX3XXX4XXX5XXX9XXX · 2 holders which blocks → ONVOY, LLC - OK 409F TULSA OK
— 918-558 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MCALESTER OK
— 918-559 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 NOWATA OK
— 918-560 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-561 6XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-562 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK 7258 OWASSO OK
— 918-563 not yet reported which blocks → OKLAHOMA WESTERN TEL. CO. 2014 ALBION OK
— 918-564 0–9 XXXall 10 · 6 holders which blocks → OKLAHOMA WINDSTREAM, INC. 2011 POTEAU OK
— 918-566 not yet reported which blocks → TOTAH COMMUNICATIONS, INC. 2030 SO HEWINS OK
— 918-567 1XXX5XXX6XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 TALIHINA OK
— 918-569 not yet reported which blocks → OKLAHOMA WESTERN TEL. CO. 2014 CLAYTON OK
— 918-571 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SALLISAW OK
— 918-573 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-574 1XXX2XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-576 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-577 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K MUSKOGEE OK
— 918-579 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-581 3XXX4XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-582 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-583 8XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-584 8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-585 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-586 2XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-587 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-588 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-589 not yet reported which blocks → SALINA-SPAVINAW TEL. CO. 2022 SPAVINAW OK
— 918-590 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK 7258 OWASSO OK
— 918-591 2XXX3XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-592 8XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-593 not yet reported which blocks → SALINA-SPAVINAW TEL. CO. 2022 STRANG OK
— 918-594 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-595 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-596 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-597 not yet reported which blocks → SALINA-SPAVINAW TEL. CO. 2022 FLINT OK
— 918-598 not yet reported which blocks → CONSOLIDATED COMMUNICATIONS OF OKLAHOMA COMPANY 1981 PEGGS OK
— 918-599 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-601 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - OK 409F NOWATA OK
— 918-604 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 PAWHUSKA OK
— 918-605 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.