NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 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, last 30 days — NPA 571
ONVOY, LLC - VA 1
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 1
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
2006-09-18 571-313 0–9 XXXall 10 · 7 holders which blocks → COMCAST IP PHONE, LLC 318J HERNDON VA
2006-08-30 571-329 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN08 VA
2006-08-14 571-366 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN08 VA
2006-07-05 571-481 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN08 VA
2006-06-02 571-309 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN08 VA
2006-05-25 571-991 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 DALE CITY VA
2006-01-26 571-379 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J MANASSAS VA
2006-01-26 571-406 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 TRIANGLE VA
2006-01-26 571-970 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2005-12-27 571-230 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2005-07-25 571-270 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2005-06-13 571-451 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J WSNGTNZN08 VA
2005-05-24 571-291 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LEESBURG VA
2005-03-23 571-292 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J MANASSAS VA
2005-03-16 571-252 0–9 XXXall 10 · 4 holders which blocks → VERIZON VIRGINIA, INC. 9213 LEESBURG VA
2005-03-01 571-209 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J LEESBURG VA
2005-01-03 571-527 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2004-12-21 571-204 0–9 XXXwhole prefix which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN19 VA
2004-09-20 571-271 0–9 XXXall 10 · 2 holders which blocks → CORETEL VIRGINIA, LLC - VA 5832 LEESBURG VA
2004-05-27 571-229 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J MANASSAS VA
2003-05-15 571-265 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2003-04-02 571-280 0–9 XXXwhole prefix which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN19 VA
2002-10-25 571-272 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2002-10-25 571-273 not yet reported which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2002-10-02 571-264 none assigned yet which blocks → METROPCS, INC. 5562 DALE CITY VA
2002-09-09 571-274 2XXX3XXX4XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2002-09-04 571-221 none assigned yet which blocks → METROPCS, INC. 5562 WSNGTNZN17 VA
2002-08-13 571-259 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2002-07-23 571-338 not yet reported which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2002-05-15 571-261 0–9 XXXall 10 · 4 holders which blocks → VERIZON SOUTH, INC. - VA (CONTEL) 0233 HAYMARKET VA
2002-03-27 571-344 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2002-03-27 571-345 4XXX5XXX6XXX8XXX which blocks → VERIZON VIRGINIA, INC. 9213 WSNGTNZN08 VA
2002-03-26 571-223 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON VIRGINIA, INC. 9213 LEESBURG VA
2002-03-18 571-262 1XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2002-03-12 571-258 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON VIRGINIA, INC. 9213 LEESBURG VA
2002-03-12 571-339 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J ENGLESIDE VA
2002-02-07 571-248 0–9 XXXall 10 · 4 holders which blocks → VERIZON SOUTH, INC. - VA (CONTEL) 0233 HAYMARKET VA
2002-01-16 571-263 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2001-12-27 571-438 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J WSNGTNZN08 VA
2001-10-09 571-251 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2001-09-17 571-243 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN08 VA
2001-08-28 571-642 1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON VIRGINIA, INC. 9213 ENGLESIDE VA
2001-08-28 571-643 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX which blocks → VERIZON VIRGINIA, INC. 9213 HERNDON VA
2001-07-13 571-245 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2001-06-25 571-246 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 LEESBURG VA
2001-06-25 571-247 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2001-06-12 571-228 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN08 VA
2001-06-12 571-244 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2001-06-08 571-334 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 HERNDON VA
2001-06-06 571-426 7XXX which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA

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.