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 781
VERIZON NEW ENGLAND INC. 232
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 92
PAETEC ITEL, LLC 69
LEVEL 3 COMMUNICATIONS, LLC - MA 59
TC SYSTEMS, INC. 57
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
— 781-438 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 STONEHAM MA
— 781-439 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J READING MA
— 781-440 1XXX which blocks → VERIZON NEW ENGLAND INC. 9102 NORWOOD MA
— 781-441 0XXX1XXX4XXX9XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 DEDHAM MA
— 781-442 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BURLINGTON MA
— 781-443 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 ARLINGTON MA
— 781-444 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEEDHAM MA
— 781-446 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WELLESLEY MA
— 781-447 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WHITMAN MA
— 781-448 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → RCN TELECOM SERVICES, INC. - MA 7619 ROCKLAND MA
— 781-449 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEEDHAM MA
— 781-451 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 WAKEFIELD MA
— 781-452 0XXX1XXX3XXX5XXX6XXX7XXX · 5 holders which blocks → PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F DUXBURY MA
— 781-453 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEEDHAM MA
— 781-454 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 STONEHAM MA
— 781-455 2XXX3XXX4XXX5XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 NEEDHAM MA
— 781-456 0XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E LEXINGTON MA
— 781-457 6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LEXINGTON MA
— 781-458 0XXX4XXX5XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E LEXINGTON MA
— 781-459 1XXX3XXX4XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DEDHAM MA
— 781-461 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 DEDHAM MA
— 781-462 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 MELROSE MA
— 781-463 0XXX1XXX3XXX5XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J LYNNFIELD MA
— 781-464 0XXX which blocks → TC SYSTEMS, INC. 7135 WALTHAM MA
— 781-465 4XXX which blocks → PAETEC ITEL, LLC 829J NEEDHAM MA
— 781-466 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WALTHAM MA
— 781-467 6XXX which blocks → VERIZON NEW ENGLAND INC. 9102 DEDHAM MA
— 781-471 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 DEDHAM MA
— 781-472 0XXX1XXX2XXX4XXX5XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 WALTHAM MA
— 781-473 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 RANDOLPH MA
— 781-474 1XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEEDHAM MA
— 781-476 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MARBLEHEAD MA
— 781-477 5XXX which blocks → VERIZON NEW ENGLAND INC. 9102 LYNN MA
— 781-478 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WALTHAM MA
— 781-479 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 LYNN MA
— 781-480 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MALDEN MA
— 781-481 0XXX which blocks → VERIZON NEW ENGLAND INC. 9102 STONEHAM MA
— 781-482 3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 LEXINGTON MA
— 781-483 0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW ENGLAND INC. 9102 ARLINGTON MA
— 781-485 7XXX9XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 REVERE MA
— 781-487 1XXX which blocks → VERIZON NEW ENGLAND INC. 9102 WALTHAM MA
— 781-488 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 ARLINGTON MA
— 781-489 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J WELLESLEY MA
— 781-491 2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → RCN TELECOM SERVICES, INC. - MA 7619 WOBURN MA
— 781-492 not yet reported which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 DEDHAM MA
— 781-493 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J DEDHAM MA
— 781-494 8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BURLINGTON MA
— 781-495 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEEDHAM MA
— 781-496 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WOBURN MA
— 781-497 4XXX5XXX6XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WOBURN MA

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.