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
— 617-842 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 QUINCY MA
— 617-843 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - MA 892D EVERETT MA
— 617-844 not yet reported which blocks → PAETEC ITEL, LLC 829J CAMBRIDGE MA
— 617-845 2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
— 617-846 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WINTHROP MA
— 617-847 2XXX7XXX which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-848 6XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BOSTON MA
— 617-850 2XXX5XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-851 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-852 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
— 617-853 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 NEWTON MA
— 617-854 0XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-855 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BELMONT MA
— 617-856 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-859 6XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-860 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BROOKLINE MA
— 617-861 1XXX5XXX7XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-862 1XXX3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
— 617-863 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW ENGLAND INC. 9102 SOMERVILLE MA
— 617-864 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-865 7XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E BOSTON MA
— 617-866 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-867 3XXX5XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-868 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-870 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BRIGHTON MA
— 617-871 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J CAMBRIDGE MA
— 617-872 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-873 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-874 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EASTBOSTON MA
— 617-875 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-876 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-877 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-878 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-879 8XXX which blocks → RCN TELECOM SERVICES, INC. - MA 7619 BROOKLINE MA
— 617-880 9XXX which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-881 4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
— 617-882 7XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E NEWTON MA
— 617-883 7XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BELMONT MA
— 617-884 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CHELSEA MA
— 617-886 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CHARLESTN MA
— 617-887 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CHELSEA MA
— 617-889 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CHELSEA MA
— 617-890 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
— 617-891 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 BRIGHTON MA
— 617-892 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
— 617-893 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEWTON MA
— 617-895 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 EASTBOSTON MA
— 617-896 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
— 617-897 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-898 0XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → VERIZON NEW ENGLAND INC. 9102 MILTON 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.