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
— 781-498 1XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MEDFORD MA
— 781-499 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → TC SYSTEMS, INC. 7135 HANOVER MA
— 781-501 0XXX5XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NORWOOD MA
— 781-502 0XXX1XXX2XXX5XXX6XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MALDEN MA
— 781-503 6XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WOBURN MA
— 781-505 2XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BURLINGTON MA
— 781-506 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RANDOLPH MA
— 781-507 1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 STONEHAM MA
— 781-509 0XXX1XXX which blocks → VERIZON NEW ENGLAND INC. 9102 READING MA
— 781-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 781-512 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LINCOLN MA
— 781-515 0XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LEXINGTON MA
— 781-516 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E WALTHAM MA
— 781-517 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MELROSE MA
— 781-519 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BRAINTREE MA
— 781-522 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WALTHAM MA
— 781-523 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → COMCAST IP PHONE, LLC 318J WHITMAN MA
— 781-524 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - MA 892D WHITMAN MA
— 781-526 not yet reported which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 MEDFORD MA
— 781-527 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 COHASSET MA
— 781-528 0XXX1XXX3XXX5XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J WOBURN MA
— 781-529 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WALTHAM MA
— 781-530 0XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 WALTHAM MA
— 781-532 not yet reported which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E LEXINGTON MA
— 781-533 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 LEXINGTON MA
— 781-534 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 WEYMOUTH MA
— 781-535 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J BRAINTREE MA
— 781-536 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E MARSHFIELD MA
— 781-537 0XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 WOBURN MA
— 781-538 1XXX2XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 LEXINGTON MA
— 781-539 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 MEDFORD MA
— 781-541 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J LEXINGTON MA
— 781-543 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 WALTHAM MA
— 781-544 1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW ENGLAND INC. 9102 SCITUATE MA
— 781-545 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 SCITUATE MA
— 781-546 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 SCITUATE MA
— 781-547 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WALTHAM MA
— 781-549 0XXX3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 REVERE MA
— 781-550 not yet reported which blocks → MA
— 781-551 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NORWOOD MA
— 781-552 3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 BURLINGTON MA
— 781-553 none assigned yet which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E LEXINGTON MA
— 781-554 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 XXXXXXXXXX MA
— 781-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST MA
— 781-556 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TC SYSTEMS, INC. 7135 HINGHAM MA
— 781-557 0XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 WAKEFIELD MA
— 781-558 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J SAUGUS MA
— 781-559 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 NEEDHAM MA
— 781-560 0XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 REVERE MA
— 781-562 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J CANTON 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.