NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

338 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
8X8, INC. 38
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
2010-08-06 414-982 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MILWAUKZN1 WI
2010-08-06 478-401 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J MILLEN GA
2010-08-06 506-817 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Minto —
2010-08-06 506-818 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 743B Nackawic —
2010-08-06 514-418 not yet reported which blocks → Iristel Inc. 154E Montreal —
2010-08-06 517-798 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 HOWELL MI
2010-08-06 586-265 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MT CLEMENS MI
2010-08-06 587-434 not yet reported which blocks → Bell Mobility 6574 Calgary —
2010-08-06 608-535 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F MADISON WI
2010-08-06 613-406 not yet reported which blocks → Bell Mobility 6574 Ottawa-Hull —
2010-08-06 620-383 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCC TELEPHONY LLC 593K GALENA KS
2010-08-06 647-390 not yet reported which blocks → Bell Mobility 6574 Toronto —
2010-08-06 647-523 not yet reported which blocks → Bell Mobility 6574 Toronto —
2010-08-06 647-933 not yet reported which blocks → Iristel Inc. 154E Toronto —
2010-08-06 709-291 not yet reported which blocks → Bell Mobility Aliant 329A Carmanville —
2010-08-06 709-730 not yet reported which blocks → Bell Mobility Aliant 329A St. John's —
2010-08-06 720-325 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DENVER CO
2010-08-06 775-407 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WELLS NV
2010-08-06 775-408 4XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WENDOVER NV
2010-08-06 780-257 not yet reported which blocks → Bell Mobility 6574 Edmonton —
2010-08-06 806-400 7XXX9XXX which blocks → T-MOBILE USA, INC. 6529 AMARILLO TX
2010-08-06 920-903 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 APPLETON WI
2010-08-05 214-856 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C MCKINNEY TX
2010-08-05 216-202 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F CLEVELAND OH
2010-08-05 234-200 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 AKRON OH
2010-08-05 234-201 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 YOUNGSTOWN OH
2010-08-05 517-528 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
2010-08-05 567-938 0–9 XXXall 10 · 9 holders which blocks → BASCOM MUTUAL TELEPHONE COMPANY - OH 849E TIFFIN OH
2010-08-05 616-427 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 GRAND RPDS MI
2010-08-05 810-293 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 FLINT MI
2010-08-05 843-410 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - SC 5258 CHARLESTON SC
2010-08-04 224-279 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WHEELING IL
2010-08-04 331-444 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2010-08-04 409-236 0–9 XXXwhole prefix which blocks → SOUTHWESTERN BELL 9533 BEAUMONT TX
2010-08-04 512-578 0–9 XXXall 10 · 2 holders which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
2010-08-04 605-304 1XXX which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F WHITE SD
2010-08-04 605-414 1XXX4XXX · 2 holders which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F CASTLEWOOD SD
2010-08-04 605-686 1XXX6XXX8XXX · 2 holders which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F ESTELLINE SD
2010-08-04 605-710 0XXX1XXX · 2 holders which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F LAKENORDEN SD
2010-08-04 605-792 1XXX which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F HAYTI SD
2010-08-04 605-922 1XXX2XXX · 2 holders which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - SD 920F ELKTON SD
2010-08-04 702-534 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LAS VEGAS NV
2010-08-04 715-914 0–9 XXXall 10 · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 RICE LAKE WI
2010-08-04 815-900 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MCHENRY IL
2010-08-03 218-515 0–9 XXXall 10 · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7770 BRAINERD MN
2010-08-03 224-888 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CARY IL
2010-08-03 408-753 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNJS WEST CA
2010-08-03 574-364 0–9 XXXall 10 · 6 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 GOSHEN IN
2010-08-03 651-347 0–9 XXXall 10 · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 RED WING MN
2010-08-03 701-576 1XXX which blocks → MIDCONTINENT COMMUNICATIONS - ND 3065 DUNSEITH ND

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.