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
2019-11-07 571-537-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2019-11-07 571-537-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2019-11-07 571-537-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2019-11-07 571-537-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2019-11-07 571-537-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2019-11-07 571-537-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2019-11-07 571-537-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2019-11-07 571-537-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2019-11-07 571-539-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2019-11-07 571-539-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2019-11-07 571-539-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2019-11-07 571-539-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2019-11-05 571-454-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 MANASSAS VA
2019-11-01 571-410-0XXX 0000–0999Assigned ONVOY, LLC - VA 138E LEESBURG VA
2019-11-01 571-410-1XXX 1000–1999Assigned ONVOY, LLC - VA 138E LEESBURG VA
2019-11-01 571-410-2XXX 2000–2999Assigned ONVOY, LLC - VA 138E LEESBURG VA
2019-11-01 571-410-3XXX 3000–3999Assigned ONVOY, LLC - VA 138E LEESBURG VA
2019-11-01 571-410-4XXX 4000–4999Assigned ONVOY, LLC - VA 138E LEESBURG VA
2019-10-30 571-397-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNGTNZN08 VA
2019-10-30 571-621-0XXX 0000–0999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 MANASSAS VA
2019-10-30 571-695-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNGTNZN17 VA
2019-10-30 571-695-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNGTNZN17 VA
2019-10-30 571-695-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - DC 7529 WSNGTNZN17 VA
2019-10-28 571-464-0XXX 0000–0999Assigned ONVOY, LLC - VA 138E HERNDON VA
2019-10-28 571-464-1XXX 1000–1999Assigned ONVOY, LLC - VA 138E HERNDON VA
2019-10-28 571-464-6XXX 6000–6999Assigned ONVOY, LLC - VA 138E HERNDON VA
2019-10-28 571-464-7XXX 7000–7999Assigned ONVOY, LLC - VA 138E HERNDON VA
2019-10-28 571-464-8XXX 8000–8999Assigned ONVOY, LLC - VA 138E HERNDON VA
2019-10-23 571-498-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LEESBURG VA
2019-10-23 571-559-6XXX 6000–6999Assigned METROPCS, INC. 5562 ENGLESIDE VA
2019-10-21 571-404-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BRADDOCK VA
2019-10-17 571-413-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DULLES VA
2019-10-07 571-300-6XXX 6000–6999Assigned METROPCS, INC. 5562 DALE CITY VA
2019-10-04 571-498-8XXX 8000–8999Assigned TELNYX LLC 073H LEESBURG VA
2019-10-03 571-413-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J DULLES VA
2019-10-01 571-360-5XXX 5000–5999Assigned TELNYX LLC 073H INDENDNTHL VA
2019-09-30 571-498-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 LEESBURG VA
2019-09-24 571-833-9XXX 9000–9999Assigned ONVOY, LLC - VA 138E MANASSAS VA
2019-09-19 571-415-1XXX 1000–1999Assigned METROPCS, INC. 5562 HAYMARKET VA
2019-09-19 571-695-1XXX 1000–1999Assigned METROPCS, INC. 5562 WSNGTNZN17 VA
2019-09-18 571-600-2XXX 2000–2999Assigned TELNYX LLC 073H DULLESMTRO VA
2019-09-13 571-464-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 HERNDON VA
2019-09-12 571-380-5XXX 5000–5999Assigned TELNYX LLC 073H LORTON VA
2019-09-12 571-415-0XXX 0000–0999Assigned TELNYX LLC 073H HAYMARKET VA
2019-09-12 571-781-9XXX 9000–9999Assigned TELNYX LLC 073H NOKESVILLE VA
2019-09-11 571-407-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN19 VA
2019-09-11 571-407-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 WSNGTNZN19 VA
2019-09-10 571-300-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DALE CITY VA
2019-09-10 571-394-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 TRIANGLE VA
2019-09-10 571-536-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN19 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.