NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

355 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
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
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
Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2002-08-16 567-349 1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HELENA OH
2002-08-16 567-357 0XXX1XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CONGRESS OH
2002-08-16 567-369 0XXX1XXX6XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HAYESVILLE OH
2002-08-16 567-404 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 FAYETTE OH
2002-08-16 567-414 0XXX1XXX2XXX5XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 GIBSONBURG OH
2002-08-16 636-205 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 WINFIELD MO
2002-08-16 740-235 0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NEVADA OH
2002-08-16 740-261 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 9 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NEWCONCORD OH
2002-08-16 740-265 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 DEXTERCITY OH
2002-08-16 740-268 0XXX1XXX2XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 RICHWOOD OH
2002-08-16 740-273 0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WILLIAMSPT OH
2002-08-16 740-279 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LOGAN OH
2002-08-16 740-287 0XXX1XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 ASHLEY OH
2002-08-16 740-365 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CALDWELL OH
2002-08-16 740-421 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CAMBRIDGE OH
2002-08-16 740-429 0XXX1XXX2XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BEVERLY OH
2002-08-16 740-431 0XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BOWERSTON OH
2002-08-16 740-433 2XXX3XXX5XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CADIZ OH
2002-08-16 740-445 0XXX1XXX5XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BARLOW OH
2002-08-16 740-513 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 DELAWARE OH
2002-08-16 928-202 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SEDONA AZ
2002-08-16 937-556 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WILMINGTON OH
2002-08-16 937-577 6XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CLARKSVL OH
2002-08-16 937-579 0XXX1XXX5XXX7XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LYNCHBURG OH
2002-08-15 208-621 none assigned yet which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LAPWAI ID
2002-08-15 254-553 3XXX4XXX5XXX6XXX7XXX8XXX which blocks → BRIGHTSPEED OF TEXAS, INC. 2114 FORT HOOD TX
2002-08-15 276-663 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 RURALRTRET VA
2002-08-15 276-664 0XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 CANA VA
2002-08-15 304-716 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WV 9944 PRINCETON WV
2002-08-15 304-902 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WV 9944 FRANKLIN WV
2002-08-15 304-903 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WV 9944 GRAFTON WV
2002-08-15 304-904 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WV 9944 WESTON WV
2002-08-15 318-232 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS LLC - LA 2896 RUSTON LA
2002-08-15 347-239 none assigned yet which blocks → METROPCS, INC. 5562 NWYRCYZN08 NY
2002-08-15 360-346 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ELMA WA
2002-08-15 586-610 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MT CLEMENS MI
2002-08-15 631-258 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2002-08-15 740-274 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 ATHENS OH
2002-08-15 740-442 5XXX6XXX7XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 IRONTON OH
2002-08-15 773-807 not yet reported which blocks → T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2002-08-15 774-353 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 BREWSTER MA
2002-08-15 774-552 0–9 XXXall 10 · 6 holders which blocks → VERIZON NEW ENGLAND INC. 9102 HYANNIS MA
2002-08-15 813-838 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 ZEPHYRHILS FL
2002-08-15 817-697 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → AT&T - LOCAL 7421 KELLER TX
2002-08-15 828-399 2XXX3XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NC 6324 SYLVA NC
2002-08-15 828-568 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K HICKORY NC
2002-08-15 928-722 2XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 SOMERTON AZ
2002-08-15 939-241 not yet reported which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2002-08-15 978-833 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 LEOMINSTER MA
2002-08-15 978-836 0–9 XXXwhole prefix which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 DANVERS MA

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.