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
— 918-623 4XXX5XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 OKEMAH OK
— 918-624 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-626 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 CEDARS OK
— 918-627 9XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-628 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-631 7XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-632 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-634 0XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-641 4XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-650 4XXX6XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 HENRYETTA OK
— 918-652 none assigned yet which blocks → SOUTHWESTERN BELL 9533 HENRYETTA OK
— 918-660 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 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
— 918-669 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-670 not yet reported which blocks → SOUTHWESTERN BELL 9533 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
— 918-680 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
— 918-686 none assigned yet which blocks → SOUTHWESTERN BELL 9533 MUSKOGEE OK
— 918-687 not yet reported which blocks → SOUTHWESTERN BELL 9533 MUSKOGEE 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
— 918-692 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-699 9XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-712 0XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-723 0XXX2XXX7XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 WESTVILLE OK
— 918-729 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 DRUMRIGHT OK
— 918-730 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-732 9XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-738 3XXX5XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 RALSTON OK
— 918-742 9XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-743 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-744 9XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-745 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-746 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-747 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-748 0XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-749 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-752 1XXX6XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 OKMULGEE OK
— 918-756 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKMULGEE 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.