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
— 781-322 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MALDEN MA
— 781-323 0XXX3XXX6XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 LEXINGTON MA
— 781-324 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MALDEN MA
— 781-325 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 LEXINGTON MA
— 781-326 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 DEDHAM MA
— 781-327 1XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F SHARON MA
— 781-328 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BURLINGTON MA
— 781-329 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 DEDHAM MA
— 781-331 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WEYMOUTH MA
— 781-332 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J CANTON MA
— 781-333 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J MALDEN MA
— 781-334 1XXX8XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 LYNNFIELD MA
— 781-335 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WEYMOUTH MA
— 781-336 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 KINGSTON MA
— 781-337 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WEYMOUTH MA
— 781-338 5XXX which blocks → VERIZON NEW ENGLAND INC. 9102 MALDEN MA
— 781-340 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WEYMOUTH MA
— 781-341 7XXX which blocks → VERIZON NEW ENGLAND INC. 9102 STOUGHTON MA
— 781-342 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 6 holders which blocks → VERIZON NEW ENGLAND INC. 9102 LYNNFIELD MA
— 781-343 1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 NEEDHAM MA
— 781-344 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 STOUGHTON MA
— 781-346 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J LYNN MA
— 781-347 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ROCKLAND MA
— 781-348 6XXX9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BRAINTREE MA
— 781-349 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J NORWOOD MA
— 781-350 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 MEDFORD MA
— 781-353 0XXX1XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BRAINTREE MA
— 781-354 not yet reported which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 LEXINGTON MA
— 781-355 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - MA 892D DEDHAM MA
— 781-356 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BRAINTREE MA
— 781-357 6XXX7XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LEXINGTON MA
— 781-358 5XXX8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WINCHESTER MA
— 781-359 4XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BURLINGTON MA
— 781-360 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 WAKEFIELD MA
— 781-361 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 KINGSTON MA
— 781-364 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 CANTON MA
— 781-365 2XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J BURLINGTON MA
— 781-366 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DEDHAM MA
— 781-367 none assigned yet which blocks → METROPCS, INC. 5562 WOBURN MA
— 781-368 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → VERIZON NEW ENGLAND INC. 9102 WINCHESTER MA
— 781-369 5XXX7XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J WINCHESTER MA
— 781-370 not yet reported which blocks → TC SYSTEMS, INC. 7135 WALTHAM MA
— 781-371 8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WELLESLEY MA
— 781-372 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LEXINGTON MA
— 781-373 0XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WALTHAM MA
— 781-374 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J HINGHAM MA
— 781-375 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 DEDHAM MA
— 781-376 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WOBURN MA
— 781-377 0XXX which blocks → VERIZON NEW ENGLAND INC. 9102 LEXINGTON MA
— 781-378 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J SCITUATE 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.