NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

41 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
ONVOY, LLC - VA 10
BANDWIDTH.COM CLEC, LLC - VA 9
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
2013-10-23 571-326-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-10-23 571-326-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-10-23 571-326-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-10-23 571-326-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-10-23 571-402-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 DALE CITY VA
2013-10-16 571-367-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 ARCOLA VA
2013-10-15 571-699-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNGTNZN08 VA
2013-10-14 571-550-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-10-14 571-550-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-10-14 571-550-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-10-14 571-550-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-10-14 571-550-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-10-14 571-550-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-10-14 571-550-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-10-14 571-781-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NOKESVILLE VA
2013-10-14 571-982-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2013-10-04 571-284-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J HAYMARKET VA
2013-10-04 571-284-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J HAYMARKET VA
2013-10-04 571-284-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J HAYMARKET VA
2013-10-03 571-367-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARCOLA VA
2013-09-30 571-353-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2013-09-30 571-375-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2013-09-30 571-485-5XXX 5000–5999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2013-09-20 571-551-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2013-09-19 571-526-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2013-09-18 571-465-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LEESBURG VA
2013-09-16 571-253-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-09-16 571-253-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-09-16 571-253-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-09-16 571-253-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN17 VA
2013-09-16 571-367-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARCOLA VA
2013-09-16 571-526-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2013-09-12 571-551-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2013-09-11 571-253-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2013-09-11 571-253-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN17 VA
2013-09-11 571-386-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN19 VA
2013-09-11 571-477-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 OCCOQUAN VA
2013-09-11 571-477-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 OCCOQUAN VA
2013-09-11 571-699-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2013-09-11 571-699-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2013-09-10 571-526-2XXX 2000–2999Assigned LEVEL 3 TELECOM OF VIRGINIA, LLC - VA 7769 HERNDON VA
2013-09-09 571-395-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN17 VA
2013-09-09 571-551-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2013-08-30 571-284-1XXX 1000–1999Assigned VERIZON SOUTH, INC. - VA (CONTEL) 0233 HAYMARKET VA
2013-08-30 571-284-2XXX 2000–2999Assigned VERIZON SOUTH, INC. - VA (CONTEL) 0233 HAYMARKET VA
2013-08-30 571-284-3XXX 3000–3999Assigned VERIZON SOUTH, INC. - VA (CONTEL) 0233 HAYMARKET VA
2013-08-30 571-284-4XXX 4000–4999Assigned VERIZON SOUTH, INC. - VA (CONTEL) 0233 HAYMARKET VA
2013-08-20 571-402-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2013-08-16 571-398-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J OCCOQUAN VA
2013-08-14 571-302-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN08 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.