NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

355 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, last 30 days
8X8, INC. 38
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
— 917-228 4XXX which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 917-229 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 917-232 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN03 NY
— 917-233 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-234 not yet reported which blocks → DIAL-A-BEEPER, INC. 6871 NWYRCYZN06 NY
— 917-235 not yet reported which blocks → DIAL-A-BEEPER, INC. 6871 NWYRCYZN06 NY
— 917-236 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN04 NY
— 917-237 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 917-238 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NWYRCYZN01 NY
— 917-239 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NWYRCYZN01 NY
— 917-240 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-241 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-247 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-248 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-249 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-252 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-253 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-255 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN08 NY
— 917-256 1XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 917-258 not yet reported which blocks → PAETEC ITEL, LLC 829J NWYRCYZN01 NY
— 917-259 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN03 NY
— 917-260 9XXX which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 917-261 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 917-262 0XXX7XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 917-263 0XXX1XXX which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 917-265 8XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 917-266 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 917-269 not yet reported which blocks → AQUIS COMMUNICATIONS, INC. 6919 NWYRCYZN06 NY
— 917-270 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN01 NY
— 917-272 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN01 NY
— 917-273 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN01 NY
— 917-274 2XXX5XXX7XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 917-275 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 917-276 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-278 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NWYRCYZN01 NY
— 917-279 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN01 NY
— 917-280 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN03 NY
— 917-281 0–9 XXXwhole prefix which blocks → PAETEC ITEL, LLC 829J NWYRCYZN01 NY
— 917-282 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN01 NY
— 917-286 6XXX7XXX · 2 holders which blocks → TC SYSTEMS, INC. - NY 7140 NWYRCYZN01 NY
— 917-287 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NWYRCYZN01 NY
— 917-288 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NWYRCYZN10 NY
— 917-289 8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NWYRCYZN01 NY
— 917-290 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 NY
— 917-291 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NWYRCYZN01 NY
— 917-292 not yet reported which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN01 NY
— 917-295 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN01 NY
— 917-296 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN01 NY
— 917-297 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NWYRCYZN01 NY
— 917-298 not yet reported which blocks → SPOK, INC. 6630 NWYRCYZN06 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.