NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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, last 30 days
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 19
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
— 617-243 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
— 617-290 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
— 617-291 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MILTON MA
— 617-292 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-293 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-294 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J EVERETT MA
— 617-295 4XXX7XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-296 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MILTON MA
— 617-297 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 DORCHESTER MA
— 617-298 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 MILTON MA
— 617-299 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE MA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.