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 860
SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 325
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 63
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 60
TELEPORT COMMUNICATIONS AMERICA, LLC - CT 56
PAETEC ITEL, LLC 50
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
— 860-464 4XXX which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 LEDYARD CT
— 860-465 9XXX which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 WILLIMNTIC CT
— 860-466 0XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 HARTFORD CT
— 860-467 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 E HAMPTON CT
— 860-468 0–9 XXXall 10 · 7 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K LEBANON CT
— 860-469 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 WINSTED CT
— 860-470 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J FARMINGTON CT
— 860-473 not yet reported which blocks → SPOK, INC. 6630 HARTFORD CT
— 860-475 not yet reported which blocks → CT
— 860-476 not yet reported which blocks → CT
— 860-478 none assigned yet which blocks → METROPCS, INC. 5562 HARTFORD CT
— 860-479 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J PLAINVILLE CT
— 860-480 6XXX7XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 TORRINGTON CT
— 860-481 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CT 4800 PUTNAM CT
— 860-482 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 TORRINGTON CT
— 860-483 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 WATERTOWN CT
— 860-484 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → METROPCS, INC. 5562 THOMASTON CT
— 860-485 7XXX which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 HARWINTON CT
— 860-486 not yet reported which blocks → PAETEC ITEL, LLC 829J STORRS CT
— 860-487 5XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 STORRS CT
— 860-488 8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEWMILFORD CT
— 860-489 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 TORRINGTON CT
— 860-490 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 HARTFORD CT
— 860-491 0XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 TORRINGTON CT
— 860-492 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 SHARON CT
— 860-493 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 HARTFORD CT
— 860-494 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 GLASTONBY CT
— 860-495 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → COMCAST IP PHONE, LLC 318J PAWCATUCK CT
— 860-496 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 TORRINGTON CT
— 860-497 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NOTHOMPSON CT
— 860-498 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K COVENTRY CT
— 860-499 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 CORNWALL CT
— 860-502 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → AT&T - LOCAL 7421 HARTFORD CT
— 860-504 not yet reported which blocks → SPOK, INC. 6630 HARTFORD CT
— 860-505 0XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEWBRITAIN CT
— 860-506 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 BRISTOL CT
— 860-507 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 FARMINGTON CT
— 860-508 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 HARTFORD CT
— 860-509 4XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 HARTFORD CT
— 860-510 1XXX6XXX8XXX9XXX which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 OLD SAYBRK CT
— 860-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CT
— 860-512 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 MANCHESTER CT
— 860-513 2XXX8XXX9XXX · 2 holders which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 HARTFORD CT
— 860-514 not yet reported which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW LONDON CT
— 860-515 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEWBRITAIN CT
— 860-516 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CT 4800 BRISTOL CT
— 860-517 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 PLAINVILLE CT
— 860-518 not yet reported which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEWBRITAIN CT
— 860-519 2XXX3XXX4XXX6XXX7XXX8XXX9XXX which blocks → COMCAST IP PHONE, LLC 318J HARTFORD CT
— 860-520 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 HARTFORD CT

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.