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
2016-02-15 631-212 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC- NY 384C COMMACK NY
2016-02-15 631-975 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC- NY 384C CTRMORICHS NY
2016-02-09 631-202 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC- NY 384C RONKONKOMA NY
2016-02-09 631-977 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC- NY 384C PATCHOGUE NY
2016-02-08 631-201 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC- NY 384C AMITYVILLE NY
2016-02-01 631-305 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRENTWOOD NY
2015-11-24 631-530 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 AMITYVILLE NY
2015-10-13 631-304 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2015-09-08 631-452 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 CENTRAISLP NY
2015-09-08 631-829 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 AMITYVILLE NY
2015-07-29 631-290 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 BABYLON NY
2015-07-16 631-937 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K SOUTHOLD NY
2015-05-21 631-214 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K DEER PARK NY
2015-01-23 631-933 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 AMITYVILLE NY
2014-12-18 631-372 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2014-12-15 631-636 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRENTWOOD NY
2014-10-14 631-644 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 RIVERHEAD NY
2014-09-30 631-746 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 AMITYVILLE NY
2014-08-28 631-260 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
2014-08-25 631-994 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRENTWOOD NY
2014-08-01 631-825 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E MONTAUK PT NY
2014-07-29 631-997 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SELDEN NY
2014-04-28 631-637 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 BRENTWOOD NY
2014-03-03 631-633 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J BELLPORT NY
2014-01-13 631-652 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 SMITHTOWN NY
2013-10-08 631-437 0–9 XXXall 10 · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 FIREISLAND NY
2013-09-16 631-992 0–9 XXXall 10 · 4 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 DEER PARK NY
2013-08-22 631-552 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 AMITYVILLE NY
2013-07-11 631-658 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K E HAMPTON NY
2013-07-11 631-743 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K PTJEFFERSN NY
2013-06-28 631-296 0–9 XXXall 10 · 8 holders which blocks → CSC VOICE, LLC 612K BRIDGEMPTN NY
2013-06-27 631-507 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 AMITYVILLE NY
2013-06-14 631-449 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 BRENTWOOD NY
2013-04-09 631-250 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K ST JAMES NY
2013-04-04 631-268 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E SOUTHAMPTN NY
2013-04-03 631-430 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E GREENPORT NY
2013-04-03 631-518 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E BAY SHORE NY
2013-04-03 631-519 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E E FIRE IS NY
2013-04-03 631-571 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E ORIENT NY
2013-04-03 631-735 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E PECONIC NY
2012-11-29 631-601 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRENTWOOD NY
2012-10-31 631-515 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC- NY 384C SHELTER IS NY
2012-10-22 631-526 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC- NY 384C BABYLON NY
2012-09-06 631-230 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E MONTAUK PT NY
2012-09-06 631-248 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E E HAMPTON NY
2012-09-06 631-359 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E WADING RIV NY
2012-09-06 631-429 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E LINDENHST NY
2012-09-06 631-535 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E PTJEFFERSN NY
2012-08-20 631-545 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E AMITYVILLE NY
2012-05-30 631-257 0–9 XXXall 10 · 7 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 SMITHTOWN 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.