NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 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 — NPA 475
ONVOY, LLC - CT 2
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
2023-12-08 475-346 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CT 639C STAMFORD CT
2023-10-18 475-344 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J BRIDGEPORT CT
2023-10-11 475-341 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 WATERBURY CT
2023-09-06 475-340 0XXX2XXX9XXX · 2 holders which blocks → ONVOY, LLC - CT 639C OLDGRNWICH CT
2023-07-26 475-335 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CT 639C GREENWICH CT
2023-07-12 475-334 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CT 639C STAMFORD CT
2023-06-23 475-324 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CT 639C TRUMBULL CT
2023-06-23 475-326 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 WATERBURY CT
2023-06-14 475-203 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CT 639C WALLINGFD CT
2023-06-14 475-375 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CT 639C NEW HAVEN CT
2023-02-14 475-318 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2023-01-06 475-317 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2022-09-26 475-337 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 WATERBURY CT
2022-09-13 475-321 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2022-09-13 475-867 0–9 XXXall 10 · 4 holders which blocks → COMMIO, LLC 939H DANBURY CT
2022-08-12 475-314 0–9 XXXall 10 · 6 holders which blocks → HD CARRIER LLC 321J HUNTINGTON CT
2022-04-26 475-339 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2022-03-09 475-356 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H BRIDGEPORT CT
2022-03-02 475-450 0–9 XXXall 10 · 3 holders which blocks → BARR TEL USA, INC. - CT 866H BRIDGEPORT CT
2022-03-02 475-480 0–9 XXXall 10 · 3 holders which blocks → BARR TEL USA, INC. - CT 866H NEW HAVEN CT
2022-03-02 475-550 0–9 XXXall 10 · 5 holders which blocks → BARR TEL USA, INC. - CT 866H STAMFORD CT
2022-03-02 475-750 0–9 XXXall 10 · 3 holders which blocks → BARR TEL USA, INC. - CT 866H DANBURY CT
2022-03-02 475-850 0–9 XXXall 10 · 5 holders which blocks → BARR TEL USA, INC. - CT 866H NORWALK CT
2022-02-08 475-332 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2022-01-27 475-548 0–9 XXXall 10 · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MERIDEN CT
2022-01-27 475-644 2XXX4XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J GEORGETOWN CT
2022-01-25 475-467 0–9 XXXall 10 · 8 holders which blocks → TON80 COMMUNICATIONS, LLC 516J TRUMBULL CT
2022-01-25 475-639 0XXX1XXX2XXX3XXX4XXX7XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J REDDING CT
2022-01-24 475-382 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BRANFORD CT
2022-01-18 475-463 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SEYMOUR CT
2022-01-18 475-763 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J NAUGATUCK CT
2022-01-17 475-622 0XXX1XXX2XXX3XXX5XXX8XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WOLCOTT CT
2022-01-14 475-316 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 WATERBURY CT
2022-01-14 475-351 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2022-01-14 475-544 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NORWALK CT
2022-01-13 475-327 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MILFORD CT
2022-01-13 475-426 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J RIDGEFIELD CT
2022-01-13 475-466 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MADISON CT
2022-01-13 475-887 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WESTPORT CT
2022-01-10 475-673 0–9 XXXall 10 · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J NORWALK CT
2022-01-10 475-832 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WILTON CT
2022-01-07 475-342 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ANSONIDRBY CT
2022-01-07 475-746 0–9 XXXall 10 · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J STAMFORD CT
2021-12-03 475-320 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2021-11-18 475-301 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2021-11-18 475-307 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 MERIDEN CT
2021-11-18 475-310 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CT 199F WALLINGFD CT
2021-11-05 475-306 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW HAVEN CT
2021-10-05 475-302 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CT 639C BRIDGEPORT CT
2021-10-05 475-304 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CT 639C HUNTINGTON CT

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.