NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

43 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 571
BANDWIDTH.COM CLEC, LLC - VA 11
ONVOY, LLC - VA 10
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 7
NEW CINGULAR WIRELESS PCS, LLC - DC 6
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6
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 thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2011-04-20 571-814-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F WSNGTNZN08 VA
2011-04-14 571-492-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J OCCOQUAN VA
2011-04-14 571-542-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2011-04-14 571-542-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2011-04-14 571-542-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2011-04-14 571-542-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2011-04-14 571-542-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2011-04-14 571-542-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2011-04-14 571-542-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2011-04-14 571-542-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2011-04-14 571-542-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2011-04-14 571-542-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2011-04-11 571-419-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2011-04-11 571-512-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN19 VA
2011-04-05 571-306-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 HERNDON VA
2011-04-05 571-429-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN08 VA
2011-04-05 571-429-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN08 VA
2011-03-30 571-316-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 DALE CITY VA
2011-03-30 571-858-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J WSNGTNZN08 VA
2011-03-28 571-421-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J WSNGTNZN17 VA
2011-03-16 571-403-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2011-03-16 571-535-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MANASSAS VA
2011-03-16 571-535-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MANASSAS VA
2011-03-14 571-442-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEESBURG VA
2011-03-14 571-442-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEESBURG VA
2011-03-14 571-442-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEESBURG VA
2011-03-09 571-858-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2011-03-09 571-858-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2011-03-07 571-409-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 OCCOQUAN VA
2011-03-07 571-409-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 OCCOQUAN VA
2011-03-07 571-422-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN17 VA
2011-03-07 571-442-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 LEESBURG VA
2011-03-07 571-455-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN19 VA
2011-03-03 571-336-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F ENGLESIDE VA
2011-02-16 571-933-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F DULLESMTRO VA
2011-02-11 571-287-4XXX 4000–4999Assigned VERIZON VIRGINIA, INC. 9213 HERNDON VA
2011-02-11 571-287-5XXX 5000–5999Assigned VERIZON VIRGINIA, INC. 9213 HERNDON VA
2011-02-09 571-429-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN08 VA
2011-02-09 571-477-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 OCCOQUAN VA
2011-02-07 571-535-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2011-02-07 571-535-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2011-02-07 571-732-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN19 VA
2011-02-07 571-732-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN19 VA
2011-02-03 571-316-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - VA 079F DALE CITY VA
2011-02-03 571-409-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 OCCOQUAN VA
2011-01-31 571-335-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2011-01-31 571-358-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2011-01-31 571-358-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2011-01-31 571-358-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MANASSAS VA
2011-01-31 571-421-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.