NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
Clear Download CSV ↓
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 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.