NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 631
VERIZON NEW YORK, INC. 230
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 64
OMNIPOINT COMMUNICATIONS, INC. - NY 55
CABLEVISION LIGHTPATH, INC. - NY 55
LEVEL 3 COMMUNICATIONS, LLC - NY 53
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
2025-09-03 631-280 not yet reported which blocks → SHELCOMM 0051 WESTHAMPTN NY
2025-03-27 631-718 7XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 RONKONKOMA NY
2025-03-27 631-934 0XXX1XXX7XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 BABYLON NY
2024-11-25 631-914 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 RIVERHEAD NY
2024-11-11 631-497 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC- NY 384C HUNTINGTON NY
2024-03-20 631-516 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC- NY 384C SELDEN NY
2024-02-20 631-999 0–9 XXXwhole prefix which blocks → YORKSTREAM COMMUNICATIONS LLC 977K JAMESPORT NY
2023-12-15 631-347 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRENTWOOD NY
2023-09-07 631-426 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 AMITYVILLE NY
2022-10-11 631-631 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E FIREISLAND NY
2022-10-10 631-814 0–9 XXXwhole prefix which blocks → ONVOY, LLC- NY 384C BABYLON NY
2022-01-27 631-349 0XXX1XXX2XXX3XXX4XXX which blocks → ONVOY, LLC- NY 384C ORIENT NY
2021-04-29 631-717 0–9 XXXall 10 · 4 holders which blocks → PEERING HUB, INC. - NY 818H BAYPORT NY
2021-02-02 631-916 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H SHOREHAM NY
2021-01-27 631-945 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC- NY 384C GREENPORT NY
2021-01-27 631-970 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC- NY 384C MATTITUCK NY
2021-01-27 631-985 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC- NY 384C RIVERHEAD NY
2021-01-27 631-986 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC- NY 384C SMITHTOWN NY
2020-12-16 631-810 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC- NY 384C LINDENHST NY
2020-07-08 631-966 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H BRENTWOOD NY
2020-05-28 631-646 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC- NY 384C SAYVILLE NY
2020-05-14 631-720 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 BRENTWOOD NY
2020-05-12 631-540 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC- NY 384C MATTITUCK NY
2020-03-26 631-984 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J DEER PARK NY
2020-03-09 631-908 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K PATCHOGUE NY
2020-03-04 631-550 0–9 XXXwhole prefix which blocks → LTE WIRELESS INC D/B/A LTE WIRELESS - NY 452J YAPHANK NY
2020-01-13 631-401 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRENTWOOD NY
2020-01-08 631-308 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 BRENTWOOD NY
2019-10-09 631-634 0–9 XXXall 10 · 7 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 COMMACK NY
2019-09-30 631-990 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → AIRUS, INC. - NY 363H BAY SHORE NY
2019-09-16 631-819 0–9 XXXwhole prefix which blocks → CSC WIRELESS, LLC 425J BAY SHORE NY
2019-09-13 631-906 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 DEER PARK NY
2019-04-24 631-939 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 RIVERHEAD NY
2018-10-30 631-818 0–9 XXXall 10 · 4 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 BABYLON NY
2018-10-15 631-690 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PATCHOGUE NY
2018-09-06 631-607 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → TC SYSTEMS, INC. - NY 7140 WADING RIV NY
2018-07-12 631-809 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 DEER PARK NY
2018-06-14 631-313 0–9 XXXall 10 · 4 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 ISLIP NY
2018-06-06 631-710 0–9 XXXall 10 · 3 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 RONKONKOMA NY
2018-04-24 631-469 0–9 XXXall 10 · 4 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 BRENTWOOD NY
2018-04-13 631-309 0–9 XXXall 10 · 3 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 AMITYVILLE NY
2018-03-13 631-508 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 RIVERHEAD NY
2017-09-01 631-303 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 AMITYVILLE NY
2017-03-28 631-640 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 AMITYVILLE NY
2017-01-24 631-310 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PATCHOGUE NY
2016-12-05 631-301 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 5 holders which blocks → TELNYX LLC 073H FARMINGDL NY
2016-06-07 631-381 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 RIVERHEAD NY
2016-06-03 631-931 0–9 XXXall 10 · 7 holders which blocks → WIDE VOICE, LLC - NY 705G E HAMPTON NY
2016-04-22 631-215 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 BRENTWOOD NY
2016-02-16 631-705 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC- NY 384C ATLANTIC NY

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.