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
— 617-682 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → YMAX COMMUNICATIONS CORP. - MA 316E CAMBRIDGE MA
— 617-683 0XXX1XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-684 3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SOMERVILLE MA
— 617-686 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-687 3XXX4XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
— 617-688 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 KINGSTON MA
— 617-689 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-690 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MILTON MA
— 617-691 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 QUINCY MA
— 617-692 0XXX2XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-693 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → ONVOY, LLC - MA 892D CAMBRIDGE MA
— 617-694 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-695 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-696 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MILTON MA
— 617-697 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-698 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MILTON MA
— 617-699 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-700 not yet reported which blocks → MA
— 617-701 3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SO BOSTON MA
— 617-702 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SOMERVILLE MA
— 617-703 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 CAMBRIDGE MA
— 617-704 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DORCHESTER MA
— 617-705 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 HYDE PARK MA
— 617-706 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
— 617-707 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 DORCHESTER MA
— 617-708 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 ROXBURY MA
— 617-709 not yet reported which blocks → MA
— 617-710 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
— 617-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 617-712 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHARLESTN MA
— 617-713 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-714 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE MA
— 617-715 not yet reported which blocks → PAETEC ITEL, LLC 829J CAMBRIDGE MA
— 617-716 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EASTBOSTON MA
— 617-717 2XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-718 3XXX4XXX5XXX · 2 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 SOMERVILLE MA
— 617-719 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-720 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-721 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-722 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-723 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-724 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-725 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-726 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-727 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-728 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-729 1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 QUINCY MA
— 617-730 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-731 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-732 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE 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.