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
— 617-355 0XXX9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-356 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-357 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-358 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-359 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
— 617-360 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 8 holders which blocks → VERIZON NEW ENGLAND INC. 9102 HYDE PARK MA
— 617-361 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 HYDE PARK MA
— 617-362 2XXX4XXX5XXX9XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E HYDE PARK MA
— 617-363 3XXX6XXX9XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 JAMAICA PL MA
— 617-364 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 HYDE PARK MA
— 617-365 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DEDHAM MA
— 617-367 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-368 0XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-369 2XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-370 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHELSEA MA
— 617-371 6XXX7XXX8XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-372 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-373 0XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-374 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-375 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-376 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-377 0XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-378 1XXX2XXX5XXX7XXX8XXX which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-379 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 DORCHESTER MA
— 617-380 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 CHARLESTN MA
— 617-381 4XXX which blocks → VERIZON NEW ENGLAND INC. 9102 EVERETT MA
— 617-382 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 EVERETT MA
— 617-383 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J BROOKLINE MA
— 617-384 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-385 not yet reported which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-387 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 EVERETT MA
— 617-388 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
— 617-389 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 EVERETT MA
— 617-390 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 JAMAICA PL MA
— 617-392 not yet reported which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-393 5XXX6XXX7XXX · 2 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 WATERTOWN MA
— 617-394 1XXX8XXX which blocks → VERIZON NEW ENGLAND INC. 9102 EVERETT MA
— 617-395 3XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 CAMBRIDGE MA
— 617-396 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 BROOKLINE MA
— 617-397 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 CAMBRIDGE MA
— 617-398 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CHARLESTN MA
— 617-399 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
— 617-400 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 ROXBURY MA
— 617-401 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 CAMBRIDGE MA
— 617-402 1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F WATERTOWN MA
— 617-403 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 BRIGHTON MA
— 617-405 0–9 XXXall 10 · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
— 617-406 7XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-407 not yet reported which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
— 617-408 0XXX1XXX which blocks → VERIZON NEW ENGLAND INC. 9102 HYDE PARK 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.