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 617
VERIZON NEW ENGLAND INC. 334
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 71
NEW CINGULAR WIRELESS PCS, LLC - DC 68
PAETEC ITEL, LLC 44
TC SYSTEMS, INC. 41
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
— 617-233 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
— 617-234 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-235 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-236 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-237 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 QUINCY MA
— 617-238 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ROXBURY MA
— 617-239 1XXX5XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-240 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SAUGUS MA
— 617-241 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CHARLESTN MA
— 617-242 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CHARLESTN MA
— 617-243 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
— 617-244 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
— 617-245 0XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 CAMBRIDGE MA
— 617-246 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-247 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-248 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-249 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
— 617-250 0XXX7XXX8XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 CAMBRIDGE MA
— 617-252 8XXX which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-253 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-254 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BRIGHTON MA
— 617-255 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-256 1XXX2XXX · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
— 617-257 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SAUGUS MA
— 617-258 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-260 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 XXXXXXXXXX MA
— 617-261 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-262 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-263 5XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-264 0XXX1XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-265 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 DORCHESTER MA
— 617-266 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-267 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-268 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 SO BOSTON MA
— 617-269 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 SO BOSTON MA
— 617-272 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MA 892D HYDE PARK MA
— 617-273 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MILTON MA
— 617-274 8XXX which blocks → PAETEC ITEL, LLC 829J BROOKLINE MA
— 617-276 1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 HYDE PARK MA
— 617-277 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-278 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-279 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
— 617-281 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WALTHAM MA
— 617-282 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 DORCHESTER MA
— 617-283 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-284 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 6 holders which blocks → VERIZON NEW ENGLAND INC. 9102 SOMERVILLE MA
— 617-285 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 SAUGUS MA
— 617-287 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 DORCHESTER MA
— 617-288 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 DORCHESTER MA
— 617-289 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON 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.