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
— 781-203 5XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BURLINGTON MA
— 781-205 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 READING MA
— 781-208 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E WALTHAM MA
— 781-209 4XXX5XXX6XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 WALTHAM MA
— 781-210 1XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 COHASSET MA
— 781-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 781-213 0XXX which blocks → VERIZON NEW ENGLAND INC. 9102 WAKEFIELD MA
— 781-215 0XXX1XXX2XXX3XXX4XXX6XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 LYNN MA
— 781-216 0XXX1XXX2XXX3XXX8XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 WALTHAM MA
— 781-217 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 KINGSTON MA
— 781-218 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 WINCHESTER MA
— 781-219 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MEDFORD MA
— 781-220 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 XXXXXXXXXX MA
— 781-221 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BURLINGTON MA
— 781-224 8XXX which blocks → VERIZON NEW ENGLAND INC. 9102 WAKEFIELD MA
— 781-226 3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E LEXINGTON MA
— 781-228 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → AT&T - LOCAL 7421 BRAINTREE MA
— 781-229 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BURLINGTON MA
— 781-230 0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E LEXINGTON MA
— 781-231 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 SAUGUS MA
— 781-232 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CANTON MA
— 781-233 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 SAUGUS MA
— 781-234 4XXX5XXX8XXX which blocks → PAETEC ITEL, LLC 829J DEDHAM MA
— 781-235 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WELLESLEY MA
— 781-237 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WELLESLEY MA
— 781-238 0XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BURLINGTON MA
— 781-239 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WELLESLEY MA
— 781-240 3XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LEXINGTON MA
— 781-241 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 REVERE MA
— 781-242 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → METROPCS, INC. 5562 HULL MA
— 781-243 3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 HANOVER MA
— 781-245 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WAKEFIELD MA
— 781-246 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WAKEFIELD MA
— 781-247 3XXX4XXX5XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J NEEDHAM MA
— 781-248 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 LYNN MA
— 781-249 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WALTHAM MA
— 781-251 1XXX which blocks → VERIZON NEW ENGLAND INC. 9102 DEDHAM MA
— 781-253 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SHARON MA
— 781-254 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 LYNN MA
— 781-255 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NORWOOD MA
— 781-256 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WALTHAM MA
— 781-257 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LINCOLN MA
— 781-258 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 WAKEFIELD MA
— 781-259 6XXX which blocks → VERIZON NEW ENGLAND INC. 9102 LINCOLN MA
— 781-260 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 XXXXXXXXXX MA
— 781-261 0XXX1XXX3XXX6XXX8XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 ROCKLAND MA
— 781-262 0XXX1XXX3XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BURLINGTON MA
— 781-263 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WELLESLEY MA
— 781-265 1XXX2XXX4XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BURLINGTON MA
— 781-266 6XXX7XXX8XXX which blocks → TC SYSTEMS, INC. 7135 LEXINGTON 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.