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
— 781-268 1XXX3XXX5XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LYNN MA
— 781-269 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 NORWOOD MA
— 781-270 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BURLINGTON MA
— 781-271 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LEXINGTON MA
— 781-272 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BURLINGTON MA
— 781-273 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BURLINGTON MA
— 781-274 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LEXINGTON MA
— 781-275 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LEXINGTON MA
— 781-276 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 LEXINGTON MA
— 781-277 1XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WEYMOUTH MA
— 781-278 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NORWOOD MA
— 781-279 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 STONEHAM MA
— 781-280 8XXX which blocks → VERIZON NEW ENGLAND INC. 9102 LEXINGTON MA
— 781-281 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WOBURN MA
— 781-282 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MALDEN MA
— 781-283 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WELLESLEY MA
— 781-284 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 REVERE MA
— 781-285 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 DUXBURY MA
— 781-286 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 REVERE MA
— 781-287 2XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WOBURN MA
— 781-288 5XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MALDEN MA
— 781-289 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 REVERE MA
— 781-290 3XXX which blocks → VERIZON NEW ENGLAND INC. 9102 WALTHAM MA
— 781-291 3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 DUXBURY MA
— 781-292 0XXX which blocks → VERIZON NEW ENGLAND INC. 9102 NEEDHAM MA
— 781-293 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BRYANTVL MA
— 781-294 2XXX3XXX6XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BRYANTVL MA
— 781-295 7XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WAKEFIELD MA
— 781-296 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 WALTHAM MA
— 781-297 none assigned yet which blocks → VERIZON NEW ENGLAND INC. 9102 STOUGHTON MA
— 781-298 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TC SYSTEMS, INC. 7135 CANTON MA
— 781-301 1XXX4XXX5XXX6XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LEXINGTON MA
— 781-302 6XXX which blocks → TC SYSTEMS, INC. 7135 CANTON MA
— 781-303 6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BRAINTREE MA
— 781-304 2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WELLESLEY MA
— 781-305 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WOBURN MA
— 781-306 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MEDFORD MA
— 781-307 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SAUGUS MA
— 781-308 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 RANDOLPH MA
— 781-309 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LYNN MA
— 781-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 781-312 1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 HANOVER MA
— 781-313 8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BURLINGTON MA
— 781-314 0XXX1XXX6XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW ENGLAND INC. 9102 WALTHAM MA
— 781-316 4XXX5XXX6XXX7XXX which blocks → RCN TELECOM SERVICES, INC. - MA 7619 ARLINGTON MA
— 781-317 2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E WALTHAM MA
— 781-318 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 STOUGHTON MA
— 781-319 2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON NEW ENGLAND INC. 9102 MARSHFIELD MA
— 781-320 2XXX which blocks → VERIZON NEW ENGLAND INC. 9102 DEDHAM MA
— 781-321 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MALDEN 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.