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 940
SOUTHWESTERN BELL 50
SOUTHWESTERN BELL TELEPHONE COMPANY - TX 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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2006-01-05 940-312 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 DENTON TX
— 940-201 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX TX
— 940-235 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-257 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-322 not yet reported which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-325 not yet reported which blocks → SOUTHWESTERN BELL 9533 MINERLWLLS TX
— 940-327 0XXX7XXX9XXX which blocks → SOUTHWESTERN BELL 9533 MINERLWLLS TX
— 940-328 9XXX which blocks → SOUTHWESTERN BELL 9533 MINERLWLLS TX
— 940-330 not yet reported which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-341 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-365 4XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 AUBREY TX
— 940-386 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-397 not yet reported which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-440 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 AUBREY TX
— 940-521 3XXX6XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 GRAHAM TX
— 940-538 2XXX3XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 HENRIETTA TX
— 940-549 not yet reported which blocks → SOUTHWESTERN BELL 9533 GRAHAM TX
— 940-550 0XXX2XXX3XXX6XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 GRAHAM TX
— 940-552 3XXX8XXX which blocks → SOUTHWESTERN BELL 9533 VERNON TX
— 940-553 0XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 VERNON TX
— 940-557 5XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-567 0XXX4XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 JACKSBORO TX
— 940-569 6XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BURKBURNTT TX
— 940-592 0XXX3XXX6XXX7XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 IOWA PARK TX
— 940-612 6XXX7XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 GAINESVL TX
— 940-663 0XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 QUANAH TX
— 940-665 not yet reported which blocks → SOUTHWESTERN BELL 9533 GAINESVL TX
— 940-668 not yet reported which blocks → SOUTHWESTERN BELL 9533 GAINESVL TX
— 940-676 not yet reported which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-689 none assigned yet which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-691 not yet reported which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-692 not yet reported which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-696 4XXX which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-716 3XXX4XXX which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-720 not yet reported which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-723 not yet reported which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-730 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-761 not yet reported which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-763 none assigned yet which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-764 1XXX9XXX which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-766 not yet reported which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-767 not yet reported which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-841 5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 BOWIE TX
— 940-851 9XXX which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-852 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 CHILLICOTH TX
— 940-855 none assigned yet which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-872 not yet reported which blocks → SOUTHWESTERN BELL 9533 BOWIE TX
— 940-880 not yet reported which blocks → SOUTHWESTERN BELL 9533 WICHITAFLS TX
— 940-928 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 BELLEVUE TX
— 940-937 4XXX5XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 CHILDRESS TX

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.