NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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 919
FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 85
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
2012-02-06 919-864 0–9 XXXall 10 · 6 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
2002-03-07 919-293 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-206 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-220 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-224 0XXX6XXX7XXX9XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-248 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-254 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-286 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-309 5XXX6XXX which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-315 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-316 0XXX8XXX9XXX which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-317 2XXX3XXX6XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-361 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-382 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-383 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-384 5XXX6XXX which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-385 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-401 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-402 3XXX6XXX7XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-403 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-405 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-406 4XXX which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-408 1XXX2XXX4XXX6XXX7XXX9XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-409 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-416 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-419 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-470 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-471 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-472 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-474 6XXX which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-476 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-477 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-479 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-484 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-485 9XXX which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-486 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-489 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-490 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-493 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-517 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-528 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 CREEDMOOR NC
— 919-529 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 CREEDMOOR NC
— 919-530 0XXX9XXX which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-541 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-544 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-547 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-549 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-558 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-560 not yet reported which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC
— 919-564 5XXX6XXX8XXX9XXX which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC 4334 DURHAM NC

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.