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 539
LEVEL 3 COMMUNICATIONS, LLC - OK 28
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
2026-06-30 539-358 4XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 PEGGS OK
2025-12-17 539-371 4XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 DISNEY OK
2022-03-31 539-270 0XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ENTERPRISE OK
2022-03-31 539-274 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 LONGTOWN OK
2022-03-31 539-285 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 KEOTA OK
2022-03-31 539-288 7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MCCURTAIN OK
2022-03-31 539-339 7XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 KEEFETON OK
2022-03-31 539-398 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WARNER OK
2021-02-26 539-241 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CHOUTEAU OK
2017-12-08 539-229 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ARPELAR OK
2017-12-08 539-899 2XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 STUART OK
2017-10-09 539-225 2XXX5XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 GORE OK
2017-10-09 539-227 2XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 KINTA OK
2017-10-09 539-331 1XXX2XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 QUINTON OK
2017-10-09 539-414 2XXX4XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 PORUM OK
2017-10-09 539-636 2XXX6XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 WEBBERSFLS OK
2017-06-07 539-798 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 FLINT OK
2017-04-17 539-328 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 COLCORD OK
2017-04-10 539-213 2XXX3XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CAMERON OK
2017-04-10 539-220 0XXX3XXX6XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HEAVENER OK
2017-04-10 539-337 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 RAMONA OK
2017-04-10 539-489 0XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 SNUGHARBOR OK
2017-04-10 539-585 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 AVANT OK
2017-04-10 539-819 0XXX1XXX2XXX3XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BARON OK
2016-12-28 539-313 0–9 XXXwhole prefix which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2016-10-25 539-206 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 LOCUST GRV OK
2016-10-25 539-219 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 STRANG OK
2016-10-17 539-205 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 SPAVINAW 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.