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
— 781-380 5XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BRAINTREE MA
— 781-381 4XXX5XXX6XXX7XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 DEDHAM MA
— 781-382 1XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 LEXINGTON MA
— 781-383 5XXX7XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 COHASSET MA
— 781-385 2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → METROPCS, INC. 5562 HINGHAM MA
— 781-386 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW ENGLAND INC. 9102 WALTHAM MA
— 781-387 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 BURLINGTON MA
— 781-388 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MALDEN MA
— 781-389 none assigned yet which blocks → METROPCS, INC. 5562 WINCHESTER MA
— 781-391 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MEDFORD MA
— 781-392 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 WALTHAM MA
— 781-393 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MEDFORD MA
— 781-394 9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BRAINTREE MA
— 781-395 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MEDFORD MA
— 781-396 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MEDFORD MA
— 781-397 5XXX which blocks → VERIZON NEW ENGLAND INC. 9102 MALDEN MA
— 781-398 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WALTHAM MA
— 781-399 0XXX1XXX2XXX5XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MALDEN MA
— 781-400 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J NEEDHAM MA
— 781-401 0XXX4XXX7XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 CANTON MA
— 781-402 2XXX4XXX9XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 LEXINGTON MA
— 781-404 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → PAETEC ITEL, LLC 829J WOBURN MA
— 781-405 none assigned yet which blocks → METROPCS, INC. 5562 WOBURN MA
— 781-406 0XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 LYNNFIELD MA
— 781-407 1XXX8XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 DEDHAM MA
— 781-409 0XXX1XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 WALTHAM MA
— 781-410 0XXX1XXX4XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DEDHAM MA
— 781-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 781-412 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCITUATE MA
— 781-415 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 CANTON MA
— 781-416 4XXX which blocks → VERIZON NEW ENGLAND INC. 9102 WELLESLEY MA
— 781-417 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 SAUGUS MA
— 781-418 4XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J BURLINGTON MA
— 781-419 not yet reported which blocks → PAETEC ITEL, LLC 829J WALTHAM MA
— 781-421 0–9 XXXall 10 · 8 holders which blocks → IP HORIZON LLC 515J ROCKLAND MA
— 781-422 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW ENGLAND INC. 9102 KINGSTON MA
— 781-423 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 ROCKLAND MA
— 781-424 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NORWELL MA
— 781-425 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J BURLINGTON MA
— 781-426 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 REVERE MA
— 781-428 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 BRAINTREE MA
— 781-429 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TC SYSTEMS, INC. 7135 NEEDHAM MA
— 781-430 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 LEXINGTON MA
— 781-431 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WELLESLEY MA
— 781-432 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 MELROSE MA
— 781-433 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEEDHAM MA
— 781-434 8XXX9XXX which blocks → TC SYSTEMS, INC. 7135 WALTHAM MA
— 781-435 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J STONEHAM MA
— 781-436 0XXX2XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E STOUGHTON MA
— 781-437 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J RANDOLPH 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.