NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
— 582-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX PA
— 582-230 0XXX1XXX2XXX6XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - PA 7315 WATTSBURG PA
— 582-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX PA
— 582-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX PA
— 582-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX PA
— 582-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST PA
— 582-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX PA
— 582-700 not yet reported which blocks → PA
— 582-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX PA
— 582-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX PA
— 582-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX PA
— 582-950 not yet reported which blocks → PA
— 582-958 not yet reported which blocks → PA
— 582-959 not yet reported which blocks → PA
— 582-976 not yet reported which blocks → PA
— 585-202 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
— 585-203 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 EROCHESTER NY
— 585-207 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K FILLMORE NY
— 585-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 585-214 9XXX which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-216 1XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 WEBSTER NY
— 585-217 0XXX1XXX2XXX3XXX6XXX7XXX · 2 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 WEBSTER NY
— 585-218 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 EROCHESTER NY
— 585-219 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 BATAVIA NY
— 585-220 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-221 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 XXXXXXXXXX NY
— 585-222 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-223 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 FAIRPORT NY
— 585-224 5XXX6XXX which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-225 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-226 0XXX1XXX7XXX · 3 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 AVON NY
— 585-227 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-229 1XXX6XXX8XXX9XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF SENECA GORHAM, INC. 0122 HONEOYE NY
— 585-230 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
— 585-231 none assigned yet which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-232 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-233 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
— 585-234 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-235 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-237 1XXX8XXX · 2 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 PERRY NY
— 585-238 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-239 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-240 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-241 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-242 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-243 8XXX which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 GENESEO NY
— 585-244 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-245 0XXX1XXX2XXX3XXX4XXX · 2 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 GENESEO NY
— 585-246 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-247 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.