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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2017-03-01 539-222 0–9 XXXall 10 · 3 holders which blocks → TELNYX LLC 073H TULSA OK
2017-03-01 539-333 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELNYX LLC 073H AFTON OK
2017-01-31 539-212 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA OK - LLC 530C PAWHUSKA OK
2017-01-31 539-323 0–9 XXXall 10 · 2 holders which blocks → NORTHEAST RURAL SERVICES, INC. - OK 945H VINITA OK
2017-01-19 539-208 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J OWASSO OK
2016-12-30 539-209 0–9 XXXall 10 · 5 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 WAGONER OK
2016-12-28 539-313 0–9 XXXwhole prefix which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TULSA OK
2016-12-14 539-292 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H TULSA OK
2016-12-08 539-215 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J TULSA OK
2016-11-09 539-207 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA OK - LLC 530C CHELSEA 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
2016-10-07 539-424 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OK 409F TULSA OK
2016-10-05 539-204 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK 7258 BRISTOW OK
2016-09-01 539-286 0–9 XXXall 10 · 8 holders which blocks → T-MOBILE USA, INC. 6529 OKMULGEE OK
2016-07-21 539-201 0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM OKLAHOMA, INC. 1965 KIOWA OK
2016-07-12 539-200 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 BARNSDALL OK
2016-07-12 539-203 0–9 XXXall 10 · 3 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 STROUD OK
2015-12-01 539-202 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OK 409F TULSA OK
2015-08-13 539-444 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OK 409F TULSA OK
2015-03-23 539-888 0–9 XXXwhole prefix which blocks → ONVOY, LLC - OK 409F TULSA OK
2015-02-17 539-999 0–9 XXXwhole prefix which blocks → ONVOY, LLC - OK 409F TULSA OK
2013-12-31 539-302 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OK 409F TULSA OK
2011-10-04 539-573 0–9 XXXall 10 · 3 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 539-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-214 0–9 XXXall 10 · 5 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 FAIRFAX OK
— 539-290 0XXX1XXX2XXX3XXX8XXX · 4 holders which blocks → ONVOY, LLC - OK 409F WUNIONTOWN OK
— 539-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-321 0XXX2XXX3XXX5XXX8XXX9XXX · 4 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 MORRIS OK
— 539-367 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J BROKENARRW OK
— 539-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-449 0XXX3XXX4XXX5XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F PORTER OK
— 539-500 1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → ONVOY, LLC - OK 409F KIEFER OK
— 539-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-538 0XXX1XXX8XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F ASHLAND OK
— 539-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST OK
— 539-600 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - OK 409F HENRYETTA OK
— 539-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-622 0XXX3XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F BOYNTON OK
— 539-635 0XXX1XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F SAVANNA OK
— 539-664 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J TULSA OK
— 539-700 not yet reported which blocks → OK
— 539-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-777 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 TULSA OK
— 539-800 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - OK 409F COMMERCE OK
— 539-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-832 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J TULSA OK
— 539-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 539-950 not yet reported which blocks → 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.