NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 203
SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 338
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 61
NEW CINGULAR WIRELESS PCS, LLC - DC 52
OMNIPOINT COMMUNICATIONS, INC. - CT 47
LEVEL 3 COMMUNICATIONS, LLC - CT 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
2001-12-14 203-994 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 DANBURY CT
2001-12-14 203-996 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 NEW HAVEN CT
2001-10-25 203-300 4XXX5XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 DANBURY CT
2001-10-25 203-500 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2001-07-27 203-810 0–9 XXXall 10 · 4 holders which blocks → CABLEVISION LIGHTPATH, INC. - CT 4950 NORWALK CT
2001-07-27 203-890 0XXX9XXX · 2 holders which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 STAMFORD CT
2001-07-27 203-953 0XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2001-07-02 203-518 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WATERBURY CT
2001-06-05 203-727 0XXX3XXX4XXX7XXX8XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2001-05-01 203-278 5XXX7XXX8XXX · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 ANSONIDRBY CT
2001-04-12 203-415 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
2001-04-04 203-405 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J WOODBURY CT
2001-03-30 203-685 not yet reported which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 BRIDGEPORT CT
2001-03-30 203-987 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CT 4800 GREENWICH CT
2001-03-26 203-570 not yet reported which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 STAMFORD CT
2001-03-26 203-650 none assigned yet which blocks → METROPCS, INC. 5562 BRIDGEPORT CT
2001-03-23 203-482 8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANBURY CT
2001-03-23 203-793 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CT 4800 WALLINGFD CT
2001-03-14 203-604 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NORWALK CT
2001-03-14 203-816 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CT 4800 TRUMBULL CT
2001-03-14 203-930 0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CT 4800 GREENWICH CT
2001-01-30 203-807 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORWALK CT
2001-01-30 203-916 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CT 4800 BRIDGEPORT CT
2001-01-30 203-956 0XXX which blocks → CABLEVISION LIGHTPATH, INC. - CT 4950 NORWALK CT
2001-01-03 203-487 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CT 4800 STAMFORD CT
2001-01-03 203-660 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CT 639C BYRAM CT
— 203-201 not yet reported which blocks → SPOK, INC. 6630 NEW HAVEN CT
— 203-202 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → CABLEVISION LIGHTPATH, INC. - CT 4950 DARIEN CT
— 203-204 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 GUILFORD CT
— 203-205 9XXX which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 DANBURY CT
— 203-206 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WATERBURY CT
— 203-207 1XXX which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 DANBURY CT
— 203-208 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J BRANFORD CT
— 203-209 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
— 203-210 5XXX7XXX8XXX · 2 holders which blocks → CABLEVISION LIGHTPATH, INC. - CT 4950 WILTON CT
— 203-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CT
— 203-213 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MERIDEN CT
— 203-214 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
— 203-215 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEW HAVEN CT
— 203-216 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WESTPORT CT
— 203-217 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WATERBURY CT
— 203-218 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BRIDGEPORT CT
— 203-219 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 STAMFORD CT
— 203-220 1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → CABLEVISION LIGHTPATH, INC. - CT 4950 TRUMBULL CT
— 203-221 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 WESTPORT CT
— 203-222 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 WESTPORT CT
— 203-223 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - CT 6624 STAMFORD CT
— 203-224 0XXX8XXX9XXX · 2 holders which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 BRIDGEPORT CT
— 203-225 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 HUNTINGTON CT
— 203-226 not yet reported which blocks → SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 9147 WESTPORT CT

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.