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 580
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
2026-05-14 580-631 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BEAVER OK
2026-05-14 580-709 6XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HOOKER OK
2023-01-24 580-787 1XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BOISE CITY OK
2017-12-08 580-691 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 CARTWRIGHT OK
2017-12-08 580-714 2XXX5XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ACHILLE OK
2017-12-08 580-733 2XXX3XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BOKCHITO OK
2017-12-08 580-942 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 COLBERT OK
2014-05-14 580-722 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 NEWKIRK OK
2005-10-12 580-599 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ENID OK
2004-04-07 580-910 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HEALDTON OK
2004-04-07 580-982 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ANTLERS OK
2003-03-04 580-368 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 DAVIS OK
2002-05-14 580-713 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 LAWTON OK
2002-05-14 580-781 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 SARKNSASCY OK
2002-05-14 580-786 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 DUNCAN OK
2002-05-01 580-686 0XXX1XXX6XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 KONAWA OK
2002-05-01 580-752 0XXX1XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HOBART OK
2002-05-01 580-798 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ARDMORE OK
2002-05-01 580-872 2XXX3XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 MADILL OK
2002-03-13 580-609 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ALVA OK
2002-03-13 580-749 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 PONCA CITY OK
2002-03-13 580-789 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BLACKWELL OK
2002-02-14 580-701 0XXX2XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ENID OK
2001-01-21 580-366 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ENID OK
— 580-215 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 LAWTON OK
— 580-635 0XXX3XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HILLSDALE OK
— 580-754 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 GUYMON OK
— 580-845 2XXX3XXX5XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TUPELO 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.