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 830
SOUTHWESTERN BELL 71
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
2001-07-10 830-221 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 NEWBRANFLS TX
2001-05-11 830-783 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 POTEET TX
2001-05-11 830-872 0–9 XXXall 10 · 5 holders which blocks → SOUTHWESTERN BELL 9533 EAGLE PASS TX
2001-04-05 830-486 1XXX2XXX3XXX4XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 UVALDE TX
— 830-239 0XXX2XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 RUNGE TX
— 830-254 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 KARNESCITY TX
— 830-256 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 CAMPBELLTN TX
— 830-264 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CHRISTINE TX
— 830-276 0XXX1XXX2XXX4XXX6XXX7XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 POTEET TX
— 830-278 0XXX which blocks → SOUTHWESTERN BELL 9533 UVALDE TX
— 830-279 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 UVALDE TX
— 830-281 0XXX1XXX6XXX7XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 PLEASANTON TX
— 830-303 not yet reported which blocks → SOUTHWESTERN BELL 9533 SEGUIN TX
— 830-334 0XXX which blocks → SOUTHWESTERN BELL 9533 PEARSALL TX
— 830-365 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 LA PRYOR TX
— 830-372 not yet reported which blocks → SOUTHWESTERN BELL 9533 SEGUIN TX
— 830-374 0XXX which blocks → SOUTHWESTERN BELL 9533 CRYSTAL CY TX
— 830-376 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BATESVILLE TX
— 830-379 not yet reported which blocks → SOUTHWESTERN BELL 9533 SEGUIN TX
— 830-386 1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 SEGUIN TX
— 830-401 3XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SEGUIN TX
— 830-420 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 MARION TX
— 830-426 0XXX which blocks → SOUTHWESTERN BELL 9533 HONDO TX
— 830-457 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 BIG WELLS TX
— 830-460 0XXX1XXX2XXX3XXX5XXX6XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BANDERA TX
— 830-468 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ASHERTON TX
— 830-510 0XXX1XXX2XXX3XXX7XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 PIPE CREEK TX
— 830-535 2XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 PIPE CREEK TX
— 830-538 0XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CASTROVL TX
— 830-557 0XXX2XXX3XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SEGUIN TX
— 830-560 0XXX2XXX3XXX6XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 SEGUIN TX
— 830-563 0XXX4XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BRACKETTVL TX
— 830-569 none assigned yet which blocks → SOUTHWESTERN BELL 9533 PLEASANTON TX
— 830-579 3XXX6XXX7XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CAMPBELLTN TX
— 830-583 7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 KENEDY TX
— 830-591 not yet reported which blocks → SOUTHWESTERN BELL 9533 UVALDE TX
— 830-606 not yet reported which blocks → SOUTHWESTERN BELL 9533 NEWBRANFLS TX
— 830-608 not yet reported which blocks → SOUTHWESTERN BELL 9533 NEWBRANFLS TX
— 830-609 4XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 NEWBRANFLS TX
— 830-612 0XXX5XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 MEDINALAKE TX
— 830-620 not yet reported which blocks → SOUTHWESTERN BELL 9533 NEWBRANFLS TX
— 830-624 1XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 NEWBRANFLS TX
— 830-625 not yet reported which blocks → SOUTHWESTERN BELL 9533 NEWBRANFLS TX
— 830-626 9XXX which blocks → SOUTHWESTERN BELL 9533 NEWBRANFLS TX
— 830-627 3XXX4XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 NEWBRANFLS TX
— 830-629 not yet reported which blocks → SOUTHWESTERN BELL 9533 NEWBRANFLS TX
— 830-643 4XXX9XXX which blocks → SOUTHWESTERN BELL 9533 NEWBRANFLS TX
— 830-663 0XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 DEVINE TX
— 830-665 0XXX1XXX3XXX6XXX7XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 DEVINE TX
— 830-709 1XXX2XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 LYTLE 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.