NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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 548
Fibernetics Corporation 159
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
2022-02-23 548-981 not yet reported which blocks → Fibernetics Corporation 464D Burford —
2022-02-23 548-982 not yet reported which blocks → Fibernetics Corporation 464D Lynden —
2022-01-31 548-412 not yet reported which blocks → Fibernetics Corporation 464D Alvinston —
2022-01-31 548-413 not yet reported which blocks → Fibernetics Corporation 464D Brigden —
2022-01-31 548-414 not yet reported which blocks → Fibernetics Corporation 464D Bright's Grove —
2022-01-31 548-415 not yet reported which blocks → Fibernetics Corporation 464D Corunna —
2022-01-31 548-416 not yet reported which blocks → Fibernetics Corporation 464D Courtright —
2022-01-31 548-417 not yet reported which blocks → Fibernetics Corporation 464D Oil Springs —
2022-01-31 548-418 not yet reported which blocks → Fibernetics Corporation 464D Petrolia —
2022-01-31 548-419 not yet reported which blocks → Fibernetics Corporation 464D Port Lambton —
2022-01-31 548-420 not yet reported which blocks → Fibernetics Corporation 464D Sombra —
2022-01-31 548-421 not yet reported which blocks → Fibernetics Corporation 464D Watford —
2022-01-31 548-422 not yet reported which blocks → Fibernetics Corporation 464D Wyoming —
2022-01-12 548-375 not yet reported which blocks → Fibernetics Corporation 464D Ridgetown —
2022-01-12 548-376 not yet reported which blocks → Fibernetics Corporation 464D Thamesville —
2022-01-12 548-377 not yet reported which blocks → Fibernetics Corporation 464D Tilbury —
2022-01-12 548-378 not yet reported which blocks → Fibernetics Corporation 464D Wallaceburg —
2022-01-11 548-370 not yet reported which blocks → Fibernetics Corporation 464D Blenheim —
2022-01-11 548-371 not yet reported which blocks → Fibernetics Corporation 464D Bothwell —
2022-01-11 548-372 not yet reported which blocks → Fibernetics Corporation 464D Dresden —
2022-01-11 548-373 not yet reported which blocks → Fibernetics Corporation 464D Highgate —
2022-01-11 548-374 not yet reported which blocks → Fibernetics Corporation 464D Merlin —
2021-09-27 548-540 not yet reported which blocks → Fibernetics Corporation 464D Atwood —
2021-09-27 548-541 not yet reported which blocks → Fibernetics Corporation 464D Dublin —
2021-09-27 548-542 not yet reported which blocks → Fibernetics Corporation 464D Harriston —
2021-09-27 548-543 not yet reported which blocks → Fibernetics Corporation 464D Mitchell —
2021-09-27 548-544 not yet reported which blocks → Fibernetics Corporation 464D Monkton —
2021-09-27 548-545 not yet reported which blocks → Fibernetics Corporation 464D Palmerston —
2021-09-27 548-546 not yet reported which blocks → Fibernetics Corporation 464D Shakespeare —
2021-09-27 548-547 not yet reported which blocks → Fibernetics Corporation 464D St. Marys —
2021-09-27 548-549 not yet reported which blocks → Fibernetics Corporation 464D Tavistock —
2021-09-22 548-256 not yet reported which blocks → Fibernetics Corporation 464D Orangeville —
2021-08-27 548-356 not yet reported which blocks → Fibernetics Corporation 464D Cargill —
2021-08-27 548-357 not yet reported which blocks → Fibernetics Corporation 464D Chatsworth —
2021-08-27 548-358 not yet reported which blocks → Fibernetics Corporation 464D Chesley —
2021-08-27 548-359 not yet reported which blocks → Fibernetics Corporation 464D Feversham —
2021-08-27 548-360 not yet reported which blocks → Fibernetics Corporation 464D Flesherton —
2021-08-27 548-361 not yet reported which blocks → Fibernetics Corporation 464D Hanover —
2021-08-27 548-362 not yet reported which blocks → Fibernetics Corporation 464D Hepworth —
2021-08-27 548-363 not yet reported which blocks → Fibernetics Corporation 464D Markdale —
2021-08-27 548-364 not yet reported which blocks → Fibernetics Corporation 464D Meaford —
2021-08-27 548-365 not yet reported which blocks → Fibernetics Corporation 464D Sauble Beach —
2021-08-27 548-366 not yet reported which blocks → Fibernetics Corporation 464D Southampton —
2021-08-27 548-367 not yet reported which blocks → Fibernetics Corporation 464D Tara —
2021-08-27 548-368 not yet reported which blocks → Fibernetics Corporation 464D Thornbury —
2021-08-27 548-369 not yet reported which blocks → Fibernetics Corporation 464D Wiarton —
2021-08-26 548-273 not yet reported which blocks → Fibernetics Corporation 464D Delhi —
2021-08-26 548-274 not yet reported which blocks → Fibernetics Corporation 464D Jarvis —
2021-08-26 548-275 not yet reported which blocks → Fibernetics Corporation 464D Langton —
2021-08-26 548-276 not yet reported which blocks → Fibernetics Corporation 464D Port Dover —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.