NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 19
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
2020-09-01 667-287 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J BISHOPVL MD
2020-09-01 667-288 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BERLIN MD
2020-09-01 667-289 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ABERDEEN MD
2020-09-01 681-327 0–9 XXXall 10 · 7 holders which blocks → NUSO, LLC 478J WHELNGZON1 WV
2020-09-01 762-258 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 COLUMBUS GA
2020-09-01 779-289 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NUSO, LLC 478J SO BELOIT IL
2020-09-01 814-537 0XXX1XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → FINGER LAKES TECHNOLOGIES GROUP, INC. - PA 464H ALTOONA PA
2020-09-01 814-841 0–9 XXXall 10 · 5 holders which blocks → FINGER LAKES TECHNOLOGIES GROUP, INC. - PA 464H ERIE PA
2020-09-01 825-393 not yet reported which blocks → TELUS 8084 Calgary —
2020-09-01 912-476 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BRUNSWICK GA
2020-09-01 937-791 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J DAYTON OH
2020-09-01 939-395 0–9 XXXwhole prefix which blocks → SUNCOM DBA T-MOBILE USA 8645 SANTURCE PR
2020-09-01 951-548 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 RIVERSIDE CA
2020-09-01 956-575 0–9 XXXwhole prefix which blocks → STPCS JOINT VENTURE, LLC 4290 MISSION TX
2020-08-31 262-272 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J NO ANTIOCH WI
2020-08-31 364-204 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J OAK GROVE KY
2020-08-31 365-544 not yet reported which blocks → Iristel Inc. 154E Brampton —
2020-08-31 431-430 not yet reported which blocks → Iristel Inc. 154E Oakbank —
2020-08-31 431-500 not yet reported which blocks → Iristel Inc. 154E Oakbank —
2020-08-31 434-368 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 EMPORIA VA
2020-08-31 478-270 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 478J MACON GA
2020-08-31 506-616 not yet reported which blocks → Iristel Inc. 154E Caraquet —
2020-08-31 509-957 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J SPOKANE WA
2020-08-31 579-539 not yet reported which blocks → Iristel Inc. 154E Chomedey —
2020-08-31 616-327 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J GRAND RPDS MI
2020-08-31 701-503 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → NUSO, LLC 478J NOMCINTOSH ND
2020-08-31 701-505 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NUSO, LLC 478J EASTSIDNEY ND
2020-08-31 825-900 not yet reported which blocks → Iristel Inc. 154E Fox Creek —
2020-08-31 825-901 not yet reported which blocks → Iristel Inc. 154E Edmonton —
2020-08-31 825-902 not yet reported which blocks → Iristel Inc. 154E Edmonton —
2020-08-31 825-904 not yet reported which blocks → Iristel Inc. 154E Calgary —
2020-08-31 825-905 not yet reported which blocks → Iristel Inc. 154E Calgary —
2020-08-31 825-906 not yet reported which blocks → Iristel Inc. 154E Calgary —
2020-08-31 912-477 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 478J SAVANNAH GA
2020-08-31 920-416 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 478J APPLETON WI
2020-08-28 208-617 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 478J BOISE ID
2020-08-28 208-998 0XXX1XXX6XXX7XXX · 2 holders which blocks → NUSO, LLC 478J TYGEE VLY ID
2020-08-28 210-895 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 SANANTONIO TX
2020-08-28 210-898 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J SANANTONIO TX
2020-08-28 254-362 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J WACO TX
2020-08-28 260-465 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → FRACTEL, LLC 965H GARRETT IN
2020-08-28 260-877 0XXX5XXX7XXX8XXX · 4 holders which blocks → FRACTEL, LLC 965H ORLAND IN
2020-08-28 310-565 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 EL SEGUNDO CA
2020-08-28 316-369 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J WICHITA KS
2020-08-28 318-740 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 FERRIDAY LA
2020-08-28 321-758 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H COCOA FL
2020-08-28 334-752 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 AUBURN AL
2020-08-28 346-429 0–9 XXXall 10 · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 BAMMEL TX
2020-08-28 346-431 0–9 XXXwhole prefix which blocks → AERIAL COMMUNICATIONS, INC. 6701 BAYTOWN TX
2020-08-28 346-434 0–9 XXXwhole prefix which blocks → AERIAL COMMUNICATIONS, INC. 6701 HSTNSUBURB TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.