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
— 918-661 not yet reported which blocks → SOUTHWESTERN BELL 9533 BARTLESVL OK
— 918-662 not yet reported which blocks → SOUTHWESTERN BELL 9533 BARTLESVL OK
— 918-663 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-664 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-665 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-666 not yet reported which blocks → SENECA TEL. CO. 1945 WESTSENECA OK
— 918-667 not yet reported which blocks → CENTRAL OKLAHOMA TELEPHONE CO., L.L.C. 1977 BOLEY OK
— 918-668 not yet reported which blocks → CENTRAL OKLAHOMA TELEPHONE CO., L.L.C. 1977 CASTLE OK
— 918-669 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-670 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-671 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-672 not yet reported which blocks → SPOK, INC. 6630 TULSA OK
— 918-673 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 PICHER OK
— 918-674 0XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 QUAPAW OK
— 918-675 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 COMMERCE OK
— 918-676 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 FAIRLAND OK
— 918-677 not yet reported which blocks → OKLAHOMA WESTERN TEL. CO. 2014 SUMMERFLD OK
— 918-678 not yet reported which blocks → WYANDOTTE TEL. CO. 2034 WYANDOTTE OK
— 918-680 none assigned yet which blocks → SOUTHWESTERN BELL 9533 MUSKOGEE OK
— 918-681 0XXX1XXX3XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 MUSKOGEE OK
— 918-682 not yet reported which blocks → SOUTHWESTERN BELL 9533 MUSKOGEE OK
— 918-683 not yet reported which blocks → SOUTHWESTERN BELL 9533 MUSKOGEE OK
— 918-684 none assigned yet which blocks → SOUTHWESTERN BELL 9533 MUSKOGEE OK
— 918-685 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKOGEE OK
— 918-686 none assigned yet which blocks → SOUTHWESTERN BELL 9533 MUSKOGEE OK
— 918-687 not yet reported which blocks → SOUTHWESTERN BELL 9533 MUSKOGEE OK
— 918-688 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-689 none assigned yet which blocks → SOUTHWESTERN BELL 9533 EUFAULA OK
— 918-690 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-691 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-692 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-693 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
— 918-694 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
— 918-695 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
— 918-696 not yet reported which blocks → OKLAHOMA WINDSTREAM, INC. 2011 STILWELL OK
— 918-697 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
— 918-698 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
— 918-699 9XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-700 not yet reported which blocks → OK
— 918-705 2XXX7XXX8XXX · 3 holders which blocks → OKLAHOMA WINDSTREAM, INC. 2011 VIAN OK
— 918-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 918-712 0XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-714 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF OKLAHOMA, LLC - OK 384H TULSA OK
— 918-717 not yet reported which blocks → PAGING TULSA, INC. 6840 TULSA OK
— 918-721 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POTEAU OK
— 918-722 not yet reported which blocks → SHIDLER TEL. CO. 2023 FORAKER OK
— 918-723 0XXX2XXX7XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 WESTVILLE OK
— 918-724 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
— 918-728 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J TULSA OK
— 918-729 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 DRUMRIGHT 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.