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
2003-01-28 585-267 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 EROCHESTER NY
2003-01-14 585-257 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J HOLCOMB NY
2002-08-13 585-981 1XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 OLEAN NY
2002-08-02 585-969 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PERRY NY
2002-06-10 585-309 5XXX7XXX which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 EROCHESTER NY
2002-05-01 585-702 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 XXXXXXXXXX NY
2002-04-17 585-201 2XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 BATAVIA NY
2002-04-04 585-503 not yet reported which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
2002-04-03 585-403 3XXX4XXX8XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 OLEAN NY
2002-03-19 585-507 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2002-02-21 585-617 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J SPENCERPT NY
2002-02-06 585-709 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
2001-12-21 585-905 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → METROPCS, INC. 5562 CANANDAGUA NY
2001-11-30 585-644 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 XXXXXXXXXX NY
2001-11-30 585-890 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
2001-07-19 585-509 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
2001-06-19 585-802 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
2001-05-21 585-409 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 TELECOM OF NEW YORK, LP - NY 8473 BATAVIA NY
2001-05-21 585-808 2XXX4XXX6XXX7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WELLSVILLE NY
2001-04-20 585-512 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 ROCHESTER NY
2001-04-11 585-302 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 PERRY NY
2001-04-11 585-519 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. - NY 7140 GENESEO NY
— 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

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.