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
— 617-832 5XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-833 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J HYDE PARK MA
— 617-834 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-835 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-836 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 CAMBRIDGE MA
— 617-837 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 QUINCY MA
— 617-838 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-839 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-840 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-841 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WINTHROP MA
— 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

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.