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 860
SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 325
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 63
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 60
TELEPORT COMMUNICATIONS AMERICA, LLC - CT 56
PAETEC ITEL, LLC 50
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
— 860-858 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J ROCKVILLE CT
— 860-859 none assigned yet which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NORWICH CT
— 860-861 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORWICH CT
— 860-862 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NORWICH CT
— 860-863 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CT 4800 SOUTHINGTN CT
— 860-864 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CT 639C STORRS CT
— 860-865 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NEW LONDON CT
— 860-866 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CT 4800 TORRINGTON CT
— 860-868 4XXX5XXX8XXX · 2 holders which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 WASHINGTON CT
— 860-870 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 ROCKVILLE CT
— 860-871 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 ROCKVILLE CT
— 860-872 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 ROCKVILLE CT
— 860-873 0XXX4XXX · 2 holders which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 MOODUS CT
— 860-874 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 HARTFORD CT
— 860-875 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 ROCKVILLE CT
— 860-876 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 OLD SAYBRK CT
— 860-877 6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SOUTHINGTN CT
— 860-878 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 HARTFORD CT
— 860-879 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CT 4800 DEEP RIVER CT
— 860-881 0XXX1XXX2XXX · 2 holders which blocks → METROPCS, INC. 5562 HARTFORD CT
— 860-882 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J HARTFORD CT
— 860-883 none assigned yet which blocks → METROPCS, INC. 5562 HARTFORD CT
— 860-884 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORWICH CT
— 860-885 4XXX which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NORWICH CT
— 860-886 none assigned yet which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NORWICH CT
— 860-887 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NORWICH CT
— 860-888 2XXX which blocks → METROPCS, INC. 5562 HARTFORD CT
— 860-889 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NORWICH CT
— 860-892 8XXX which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 NORWICH CT
— 860-893 3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J NEWBRITAIN CT
— 860-894 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → AT&T - LOCAL 7421 MIDDLETOWN CT
— 860-895 0XXX2XXX3XXX4XXX6XXX7XXX · 5 holders which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 HARTFORD CT
— 860-896 5XXX7XXX8XXX which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 ROCKVILLE CT
— 860-901 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WINDSORLKS CT
— 860-902 0XXX2XXX3XXX4XXX5XXX6XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WINDSOR CT
— 860-903 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WINDSORLKS CT
— 860-904 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HARTFORD CT
— 860-906 1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HARTFORD CT
— 860-907 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WINDSOR CT
— 860-908 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORWICH CT
— 860-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CT
— 860-912 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 NEW LONDON CT
— 860-913 1XXX2XXX · 2 holders which blocks → METROPCS, INC. 5562 HARTFORD CT
— 860-915 4XXX5XXX7XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J NEWMILFORD CT
— 860-916 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 HARTFORD CT
— 860-918 7XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 GLASTONBY CT
— 860-919 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 SOUTHINGTN CT
— 860-920 2XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HARTFORD CT
— 860-921 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J TORRINGTON CT
— 860-922 none assigned yet which blocks → METROPCS, INC. 5562 HARTFORD CT

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.