NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
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
2018-02-13 463-999 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - IN 097D INDIANAPLS IN
2018-02-13 479-327 0XXX1XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 STRICKLER AR
2018-02-13 479-328 0XXX1XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - AR 5179 MORROW AR
2018-02-13 539-223 not yet reported which blocks → CROSS CABLE TELEVISION, LLC - OK 809H STIGLER OK
2018-02-13 539-226 not yet reported which blocks → CROSS CABLE TELEVISION, LLC - OK 809H CHECOTAH OK
2018-02-13 551-230 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NJ 637C ENGLEWOOD NJ
2018-02-13 602-825 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
2018-02-13 667-230 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G CENTREVL MD
2018-02-13 812-979 0–9 XXXall 10 · 5 holders which blocks → SEI DATA, INC. - IN 4704 NO VERNON IN
2018-02-13 857-343 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2018-02-13 939-450 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-13 939-451 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-13 939-454 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-13 939-456 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-13 939-457 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-13 939-458 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-13 939-460 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-13 939-499 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-13 985-800 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - LA 749E MADISONVL LA
2018-02-12 319-412 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2018-02-12 563-396 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DAVENPORT IA
2018-02-12 669-277 0–9 XXXwhole prefix which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SUNNYVALE CA
2018-02-12 712-509 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SIOUX CITY IA
2018-02-09 343-323 not yet reported which blocks → TELUS Integrated Communications 2782 Kingston —
2018-02-09 407-640 0–9 XXXall 10 · 3 holders which blocks → METROPCS NETWORKS, LLC 899D ORLANDO FL
2018-02-09 417-415 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SPRINGFLD MO
2018-02-09 475-889 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NORWALK CT
2018-02-09 480-645 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2018-02-09 618-361 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PINCKNEYVL IL
2018-02-09 662-966 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → AIRUS, INC. - MS 459H CLARKSDALE MS
2018-02-09 747-494 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J CANOGAPARK CA
2018-02-09 814-986 0XXX9XXX · 2 holders which blocks → WINDSTREAM PENNSYLVANIA, INC. 0176 WARIRSMARK PA
2018-02-09 907-917 0–9 XXXall 10 · 3 holders which blocks → WIDE VOICE, LLC - AK 753H ANCHORAGE AK
2018-02-09 939-490 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-09 939-491 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-09 939-493 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-09 939-494 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-09 939-496 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-09 939-497 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-09 939-498 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2018-02-09 947-522 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ROYAL OAK MI
2018-02-08 236-477 not yet reported which blocks → TELUS 8086 Vancouver —
2018-02-08 469-389 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FRISCO TX
2018-02-08 712-481 0–9 XXXall 10 · 6 holders which blocks → AIRUS, INC. - NE 478H SHENANDOAH IA
2018-02-08 806-600 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PLAINVIEW TX
2018-02-08 850-706 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - FL 8300 CENTURY FL
2018-02-08 906-767 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 IRONWOOD MI
2018-02-08 917-594 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN01 NY
2018-02-08 917-920 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN01 NY
2018-02-08 929-459 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN04 NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.