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 585
FRONTIER TELEPHONE OF ROCHESTER, INC. 186
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 69
ONVOY, LLC- NY 56
NEW CINGULAR WIRELESS PCS, LLC - DC 47
VERIZON NEW YORK, INC. 40
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
2017-03-20 585-407 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H VICTOR NY
2017-03-20 585-513 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H BERGEN NY
2017-03-17 585-541 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC- NY 384C CASTILE NY
2017-03-10 585-405 0–9 XXXall 10 · 5 holders which blocks → XO NEW YORK, INC. 8340 ROCHESTER NY
2016-12-22 585-448 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K ROCHESTER NY
2016-12-05 585-401 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → TELNYX LLC 073H WYOMING NY
2016-08-15 585-404 0–9 XXXall 10 · 7 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K HENRIETTA NY
2016-05-20 585-577 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E CANANDAGUA NY
2016-05-02 585-390 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC- NY 384C BYRON NY
2016-03-18 585-312 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E ELBA NY
2016-03-18 585-316 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E KENDALL NY
2016-03-09 585-304 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E OAKFIELD NY
2016-01-05 585-774 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC- NY 384C ALBION NY
2016-01-04 585-685 0–9 XXXall 10 · 6 holders which blocks → INTEGRATED PATH COMMUNICATIONS, LLC - NY 271G ROCHESTER NY
2015-12-09 585-539 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E CUBA NY
2015-11-09 585-430 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 FAIRPORT NY
2015-10-14 585-629 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2015-09-28 585-498 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E ROCHESTER NY
2015-09-28 585-536 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 BATAVIA NY
2015-09-28 585-664 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 BATAVIA NY
2015-07-29 585-417 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J ROCHESTER NY
2015-07-16 585-597 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → EMPIRE LONG DISTANCE CORPORATION 087H CORFU NY
2015-05-19 585-684 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E HOLLEY NY
2015-03-31 585-736 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2015-03-17 585-673 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E EROCHESTER NY
2015-03-06 585-532 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 ROCHESTER NY
2015-01-23 585-524 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 BATAVIA NY
2014-10-17 585-434 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K ROCHESTER NY
2014-10-09 585-656 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ATTICA NY
2014-10-08 585-642 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2014-09-29 585-628 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BELFAST NY
2014-09-29 585-635 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 EROCHESTER NY
2014-09-24 585-634 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J RUSHVILLE NY
2014-09-05 585-491 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2014-08-25 585-623 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2014-07-29 585-363 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J ROCHESTER NY
2014-05-30 585-622 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2014-04-23 585-485 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 EROCHESTER NY
2014-03-10 585-449 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 BELMONT NY
2014-02-25 585-483 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E BATAVIA NY
2013-12-17 585-484 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 TELECOM OF NEW YORK, LP - NY 8473 ROCHESTER NY
2013-10-29 585-481 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2013-10-04 585-357 0–9 XXXall 10 · 8 holders which blocks → PAETEC ITEL, LLC 829J ALBION NY
2013-08-30 585-215 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 WYOMING NY
2013-07-19 585-471 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2013-06-14 585-446 0–9 XXXall 10 · 8 holders which blocks → LEVEL 3 TELECOM OF NEW YORK, LP - NY 8473 W WEBSTER NY
2012-10-22 585-445 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 551G ROCHESTER NY
2012-08-07 585-443 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 GENESEO NY
2012-06-25 585-435 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2012-06-11 585-397 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 ROCHESTER 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.