NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

360 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 26
Rogers Communications Canada Inc. (Wireless) 23
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
2014-03-31 813-603 0–9 XXXall 10 · 4 holders which blocks → MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPAEST FL
2014-03-31 816-599 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7594 KANSASCITY MO
2014-03-31 859-639 0–9 XXXwhole prefix which blocks → WINDSTREAM KENTUCKY EAST, INC. - LEXINGTON 9690 LEXINGTON KY
2014-03-31 954-860 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 FTLAUDERDL FL
2014-03-28 206-294 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2014-03-28 224-257 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC 224C DESPLAINES IL
2014-03-28 304-814 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - WV 080F BUFFALO WV
2014-03-28 469-843 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7148 WAXAHACHIE TX
2014-03-28 469-901 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 WAXAHACHIE TX
2014-03-28 501-415 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 LONOKE AR
2014-03-28 602-802 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
2014-03-28 636-206 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C ST CHARLES MO
2014-03-28 774-843 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MARLBORO MA
2014-03-28 786-630 0–9 XXXwhole prefix which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 MIAMI FL
2014-03-28 813-530 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J TAMPAEST FL
2014-03-28 915-704 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 EL PASO TX
2014-03-27 254-431 0–9 XXXall 10 · 4 holders which blocks → AMA COMM., LLC DBA AMA*TECHTEL COMMUNICATIONS-TX 0132 STEPHENVL TX
2014-03-27 510-426 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RICHMOND CA
2014-03-27 510-876 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C HAYWARD CA
2014-03-27 510-935 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2014-03-27 559-556 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TULARE CA
2014-03-27 567-407 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J PLYMOUTH OH
2014-03-27 567-423 0–9 XXXall 10 · 8 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J PERRYSVL OH
2014-03-27 586-217 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C ROSEVILLE MI
2014-03-27 618-320 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OLNEY IL
2014-03-27 702-857 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NV 029F LAS VEGAS NV
2014-03-27 774-606 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ATTLEBORO MA
2014-03-27 916-936 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FOLSOM CA
2014-03-27 937-856 0–9 XXXall 10 · 3 holders which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B DAYTON OH
2014-03-26 402-207 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NE 995E SUPERIOR NE
2014-03-26 417-755 0–9 XXXall 10 · 4 holders which blocks → UNITED STATES CELLULAR - MO 6275 SPRINGFLD MO
2014-03-26 581-634 not yet reported which blocks → TELUS Quebec 2243 St-Methode-de-Frontenac —
2014-03-26 647-543 not yet reported which blocks → Bell Mobility 6574 Toronto —
2014-03-26 709-575 not yet reported which blocks → Bragg Communications Inc. 4878 Brent's Cove —
2014-03-26 719-399 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CO 6118 AGUILAR CO
2014-03-26 816-895 0–9 XXXall 10 · 5 holders which blocks → EVERFAST FIBER NETWORKS LLC 3915 KANSASCITY MO
2014-03-26 845-643 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → CSC VOICE, LLC 612K NYACK NY
2014-03-26 873-391 not yet reported which blocks → TELUS Quebec 2243 Deschaillons —
2014-03-26 980-221 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC 7835 CHARLOTTE NC
2014-03-25 205-650 0–9 XXXall 10 · 8 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 TUSCALOOSA AL
2014-03-25 205-779 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J ALICEVILLE AL
2014-03-25 224-352 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HALF DAY IL
2014-03-25 224-423 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DESPLAINES IL
2014-03-25 252-424 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NC 998E SWNSBRWCAR NC
2014-03-25 414-533 0–9 XXXall 10 · 2 holders which blocks → PAETEC ITEL, LLC 829J MILWAUKZN1 WI
2014-03-25 475-329 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CT 199F DANBURY CT
2014-03-25 507-512 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MN 184D ROCHESTER MN
2014-03-25 513-817 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J CINCINNATI OH
2014-03-25 567-352 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J HASKISTGNY OH
2014-03-25 567-612 0–9 XXXall 10 · 2 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J GREEN SPG OH

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.