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 315
VERIZON NEW YORK, INC. 216
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 78
PAETEC ITEL, LLC 63
TWC IP ENABLED SERVICES, LLC 46
NEW CINGULAR WIRELESS PCS, LLC - DC 46
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
2016-01-15 315-201 0–9 XXXwhole prefix which blocks → ONVOY, LLC- NY 384C MACDOUGALL NY
2015-09-11 315-993 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J WADDINGTON NY
2015-06-08 315-991 0–9 XXXall 10 · 5 holders which blocks → BALTIMORE-WASHINGTON TELEPHONE COMPANY - NY 782G SYRACUSE NY
2015-04-27 315-992 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E SYRACUSE NY
2015-03-19 315-975 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 AUBURN NY
2015-03-04 315-933 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E SEMPRONIUS NY
2015-01-29 315-795 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROME NY
2014-12-24 315-969 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC- NY 384C FABIUS NY
2014-12-24 315-974 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC- NY 384C CAMDEN NY
2014-12-15 315-922 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 UTICA NY
2014-10-31 315-965 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J WATERTOWN NY
2014-10-31 315-968 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC- NY 384C PARISH NY
2014-10-31 315-973 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J CLAYTON NY
2014-09-23 315-967 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 FAYETTEVL NY
2014-08-25 315-864 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 UTICA NY
2014-08-01 315-940 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E HERKIMER NY
2014-07-29 315-949 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SYRACUSE NY
2014-07-01 315-930 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 SYRACUSE NY
2014-06-02 315-929 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E CONSTANTIA NY
2014-06-02 315-954 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E UNION SPG NY
2013-07-26 315-802 0–9 XXXall 10 · 5 holders which blocks → XO NEW YORK, INC. 8340 SYRACUSE NY
2013-07-26 315-925 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SYRACUSE NY
2012-10-28 315-728 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 551G SYRACUSE NY
2012-08-23 315-801 0–9 XXXall 10 · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 UTICA NY
2012-08-17 315-840 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E JORDAN NY
2012-07-17 315-951 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E CANASTOTA NY
2012-06-14 315-888 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FINGER LAKES TECHNOLOGIES GROUP, INC. - NY 629E AMBER NY
2011-09-08 315-401 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 SYRACUSE NY
2011-07-11 315-418 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 SYRACUSE NY
2011-07-11 315-570 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 UTICA NY
2011-07-11 315-816 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 WATERTOWN NY
2011-05-09 315-862 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 MARCELLUS NY
2011-05-09 315-892 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 PHOENIX NY
2011-05-09 315-932 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 MANLIUS NY
2011-05-09 315-962 0–9 XXXall 10 · 4 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 CAZENOVIA NY
2011-05-09 315-972 0XXX2XXX3XXX7XXX · 2 holders which blocks → WINDSTREAM NEW YORK, INC. - FULTON 0106 W WINFIELD NY
2011-03-18 315-757 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E MORAVIA NY
2011-03-18 315-758 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E WEEDSPORT NY
2011-03-16 315-766 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC- NY 384C SYRACUSE NY
2011-03-07 315-748 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 SYRACUSE NY
2011-02-07 315-741 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 SYRACUSE NY
2011-01-20 315-818 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E EVANSMILLS NY
2011-01-17 315-760 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 SYRACUSE NY
2010-09-10 315-726 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 SYRACUSE NY
2010-09-07 315-565 0–9 XXXall 10 · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K SYRACUSE NY
2010-08-19 315-544 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E CARTHAGE NY
2010-07-13 315-710 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E BRIDGEPORT NY
2010-07-09 315-494 0–9 XXXall 10 · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K MARCELLUS NY
2010-07-07 315-504 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K LAFAYETTE NY
2010-07-07 315-514 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K MASSENA 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.