NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
T-MOBILE USA, INC. 45
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
2025-03-20 580-608 0XXX1XXX5XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 KINGSTON OK
2022-07-27 580-469 0XXX1XXX2XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SAYRE OK
2022-06-13 580-865 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PONCA CITY OK
2022-04-29 580-707 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 ENID OK
2019-04-09 580-943 0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 DUNCAN OK
2019-04-08 580-501 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ADA OK
2019-04-08 580-643 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALTUS OK
2019-04-04 580-644 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELK CITY OK
2018-10-31 580-344 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ADA OK
2017-08-10 580-970 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALTUS OK
2017-06-23 580-853 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DURANT OK
2017-02-02 580-967 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ADA OK
2014-07-25 580-290 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 WOODWARD OK
2013-12-23 580-447 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ADA OK
2013-04-23 580-500 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 CLINTON OK
2006-10-23 580-715 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 CLINTON OK
2006-10-23 580-890 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WEATHERFD OK
2002-11-18 580-551 0XXX1XXX6XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ENID OK
2002-05-23 580-812 1XXX2XXX3XXX4XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MARIETTA OK
2002-05-20 580-649 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALTUS OK
2002-05-03 580-760 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DURANT OK
2002-04-18 580-830 8XXX which blocks → T-MOBILE USA, INC. 6529 PERRY OK
2002-04-16 580-823 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 TONKAWA OK
2002-04-09 580-736 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DUNCAN OK
2002-04-09 580-756 1XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 MARLOW OK
2002-04-09 580-917 4XXX7XXX which blocks → T-MOBILE USA, INC. 6529 LAWTON OK
2002-03-27 580-606 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 DUNCAN OK
2001-04-03 580-647 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 LAWTON OK
— 580-210 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 ELK CITY OK
— 580-275 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CLINTON OK
— 580-277 1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARDMORE OK
— 580-278 0XXX2XXX3XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ENID OK
— 580-280 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LAWTON OK
— 580-284 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LAWTON OK
— 580-340 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 ARDMORE OK
— 580-341 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ARDMORE OK
— 580-375 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 WEATHERFD OK
— 580-401 1XXX2XXX4XXX6XXX7XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PONCA CITY OK
— 580-402 8XXX which blocks → T-MOBILE USA, INC. 6529 ENID OK
— 580-484 7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 ENID OK
— 580-485 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PONCA CITY OK
— 580-491 1XXX2XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PONCA CITY OK
— 580-771 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LAWTON OK
— 580-818 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARDMORE OK
— 580-850 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARDMORE OK

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.