NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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, last 30 days — NPA 539
NEW CINGULAR WIRELESS PCS, LLC - IL 1
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
2019-10-02 539-237 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → UNITED STATES CELLULAR - OK 6272 STIGLER OK
2019-09-03 539-236 0XXX6XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA OK - LLC 530C INOLA OK
2019-08-27 539-235 0–9 XXXall 10 · 4 holders which blocks → EXIANT COMMUNICATIONS LLC 114J TULSA OK
2019-07-29 539-234 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J TAHLEQUAH OK
2019-05-09 539-265 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F SAPULPA OK
2019-04-15 539-230 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SALLISAW OK
2019-04-04 539-216 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHECOTAH OK
2019-04-04 539-231 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 DEWEY OK
2019-04-04 539-269 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 EUFAULA OK
2019-04-02 539-228 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CSC WIRELESS, LLC 425J GROVE OK
2019-02-20 539-900 0–9 XXXall 10 · 2 holders which blocks → TERRA NOVA TELECOM INC. 145J TULSA OK
2018-10-29 539-629 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 TULSA OK
2018-09-21 539-224 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → ONVOY, LLC - OK 409F WMAYSVILLE OK
2018-08-31 539-325 0–9 XXXall 10 · 8 holders which blocks → CROSS CABLE TELEVISION, LLC - OK 809H TULSA OK
2018-02-13 539-223 not yet reported which blocks → CROSS CABLE TELEVISION, LLC - OK 809H STIGLER OK
2018-02-13 539-226 not yet reported which blocks → CROSS CABLE TELEVISION, LLC - OK 809H CHECOTAH OK
2017-12-15 539-430 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D TULSA OK
2017-12-13 539-221 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 HASKELL OK
2017-12-12 539-244 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - OK 409F OKMULGEE 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
2017-12-04 539-245 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J POCOLA OK
2017-12-04 539-352 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J MOFFETT OK
2017-10-25 539-609 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BARTLESVL 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
2017-09-29 539-666 0–9 XXXwhole prefix which blocks → ONVOY, LLC - OK 409F TULSA OK
2017-09-25 539-217 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J SAND SPG OK
2017-09-11 539-525 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J TULSA OK
2017-08-22 539-233 0–9 XXXwhole prefix which blocks → ONVOY, LLC - OK 409F TULSA OK
2017-08-03 539-867 0–9 XXXall 10 · 6 holders which blocks → COMMIO, LLC 939H TULSA OK
2017-07-20 539-218 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK 7258 MUSKOGEE 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
2017-04-10 539-232 0–9 XXXall 10 · 7 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J WILBURTON OK
2017-04-10 539-299 0XXX1XXX2XXX3XXX5XXX6XXX7XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J OKEMAH OK
2017-04-10 539-305 3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J KETCHUM 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
2017-04-10 539-589 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SKIATOOK OK
2017-04-10 539-785 1XXX2XXX7XXX · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J WISTER OK
2017-04-10 539-819 0XXX1XXX2XXX3XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BARON OK
2017-03-28 539-210 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H PRYOR OK
2017-03-28 539-345 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELNYX LLC 073H GROVE 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.