NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

354 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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. 39
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 20
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
2010-12-23 939-277 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 939-281 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 939-282 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 939-283 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 939-284 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 939-285 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 939-286 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 939-287 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-23 956-590 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BROWNSVL TX
2010-12-23 989-502 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C FRANKENMTH MI
2010-12-22 289-909 not yet reported which blocks → Videotron Ltd. 383F Newmarket —
2010-12-22 289-994 not yet reported which blocks → Videotron Ltd. 383F Hamilton —
2010-12-22 317-600 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
2010-12-22 317-800 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
2010-12-22 434-338 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J LYNCHBURG VA
2010-12-22 647-606 not yet reported which blocks → Videotron Ltd. 383F Toronto —
2010-12-22 647-607 not yet reported which blocks → Videotron Ltd. 383F Toronto —
2010-12-22 647-608 not yet reported which blocks → Videotron Ltd. 383F Toronto —
2010-12-22 647-609 not yet reported which blocks → Videotron Ltd. 383F Toronto —
2010-12-22 815-300 0–9 XXXwhole prefix which blocks → ILLINOIS BELL TEL CO 9329 NEW LENOX IL
2010-12-22 818-945 0XXX1XXX5XXX6XXX9XXX · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C GLENDALE CA
2010-12-22 845-250 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K WHITE LAKE NY
2010-12-22 845-251 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K SHOKAN NY
2010-12-22 845-253 0–9 XXXall 10 · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K KERHONKSON NY
2010-12-22 856-200 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 VINELAND NJ
2010-12-22 872-400 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN03 IL
2010-12-22 954-300 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 FTLAUDERDL FL
2010-12-21 210-556 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SANANTONIO TX
2010-12-21 210-793 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SANANTONIO TX
2010-12-21 234-500 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CORTLAND OH
2010-12-21 252-381 0–9 XXXall 10 · 5 holders which blocks → MCC TELEPHONY LLC 593K WOODVILLE NC
2010-12-21 289-354 not yet reported which blocks → TELUS Mobility 8303 Port Perry —
2010-12-21 347-790 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E NWYRCYZN06 NY
2010-12-21 440-400 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CHAGRINFLS OH
2010-12-21 440-800 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 VICTORY OH
2010-12-21 571-421 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN17 VA
2010-12-21 571-533 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN17 VA
2010-12-21 579-488 not yet reported which blocks → TELUS Mobility 8303 Granby —
2010-12-21 620-300 0–9 XXXall 10 · 5 holders which blocks → N.E. COLORADO CELLULAR, INC. 6874 GREAT BEND KS
2010-12-21 732-228 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 TOMS RIVER NJ
2010-12-21 734-707 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C ANN ARBOR MI
2010-12-21 801-888 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
2010-12-21 832-589 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOUSTON TX
2010-12-21 937-872 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C JAMESTOWN OH
2010-12-20 252-713 0–9 XXXall 10 · 5 holders which blocks → MCC TELEPHONY LLC 593K COLERAIN NC
2010-12-20 317-438 0–9 XXXall 10 · 2 holders which blocks → AT&T ENTERPRISES, LLC 516C INDIANAPLS IN
2010-12-20 574-400 0–9 XXXall 10 · 7 holders which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - IN 874F SOUTH BEND IN
2010-12-20 812-800 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J CHARLESTN IN
2010-12-20 832-599 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLEVELAND TX
2010-12-20 870-724 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C GURDON AR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.