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 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
— 918-758 5XXX which blocks → SOUTHWESTERN BELL 9533 OKMULGEE OK
— 918-759 3XXX7XXX which blocks → SOUTHWESTERN BELL 9533 OKMULGEE OK
— 918-762 0XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 PAWNEE OK
— 918-764 0XXX5XXX6XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-766 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BARTLESVL OK
— 918-772 0XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 TAHLEQUAH OK
— 918-774 none assigned yet which blocks → SOUTHWESTERN BELL 9533 SALLISAW OK
— 918-775 not yet reported which blocks → SOUTHWESTERN BELL 9533 SALLISAW OK
— 918-776 not yet reported which blocks → SOUTHWESTERN BELL 9533 SALLISAW OK
— 918-781 2XXX3XXX9XXX which blocks → SOUTHWESTERN BELL 9533 MUSKOGEE OK
— 918-782 0XXX5XXX6XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 KETCHUM OK
— 918-786 0XXX which blocks → SOUTHWESTERN BELL 9533 GROVE OK
— 918-787 not yet reported which blocks → SOUTHWESTERN BELL 9533 GROVE OK
— 918-789 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 CHELSEA OK
— 918-791 0XXX2XXX3XXX4XXX5XXX6XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 GROVE OK
— 918-824 0XXX3XXX5XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 PRYOR OK
— 918-825 not yet reported which blocks → SOUTHWESTERN BELL 9533 PRYOR OK
— 918-828 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-831 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-832 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-833 0XXX1XXX2XXX4XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-834 0XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-835 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-836 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-838 2XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-862 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 OILTON OK
— 918-875 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 MOFFETT OK
— 918-898 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX OK
— 918-925 2XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-939 6XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-952 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX OK
— 918-962 0XXX4XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SPIRO OK
— 918-967 0XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 STIGLER OK
— 918-969 3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BOKOSHE OK
— 918-971 8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-988 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX 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.