NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 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 415
BOOST SUBSCRIBERCO L.L.C. 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 thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2006-08-06 415-508-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2006-08-04 415-325-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC JUNPR CA
2006-08-03 415-814-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2006-08-03 415-814-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC CNTRL CA
2006-07-26 415-737-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CORTEMADRA CA
2006-07-20 415-272-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAUSALITO CA
2006-07-14 415-287-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2006-07-14 415-738-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-07-13 415-236-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 INVERNESS CA
2006-07-05 415-646-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2006-07-05 415-695-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2006-07-05 415-707-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2006-07-05 415-746-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2006-06-29 415-450-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN RAFAEL CA
2006-06-29 415-672-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC JUNPR CA
2006-06-29 415-686-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SAN RAFAEL CA
2006-06-13 415-690-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BELVEDERE CA
2006-06-09 415-339-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SAUSALITO CA
2006-06-09 415-347-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNFC JUNPR CA
2006-06-09 415-384-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MILLVALLEY CA
2006-06-09 415-482-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SAN RAFAEL CA
2006-06-09 415-496-8XXX 8000–8999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 CORTEMADRA CA
2006-06-09 415-649-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNFC MT-EV CA
2006-06-09 415-662-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 NICASIO CA
2006-06-09 415-663-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 POINTREYES CA
2006-06-09 415-669-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 INVERNESS CA
2006-06-09 415-797-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 BELVEDERE CA
2006-06-09 415-868-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 STNSN-BLNS CA
2006-06-09 415-881-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 IGNACIO CA
2006-06-09 415-895-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 NOVATO CA
2006-05-31 415-287-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC JUNPR CA
2006-05-25 415-324-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SAUSALITO CA
2006-05-25 415-367-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SAUSALITO CA
2006-05-25 415-746-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2006-05-25 415-746-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SNFC CNTRL CA
2006-05-18 415-671-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-05-18 415-671-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-05-18 415-675-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-05-18 415-675-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-05-18 415-692-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-05-18 415-692-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2006-05-15 415-702-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C SNFC MT-EV CA
2006-05-09 415-686-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAN RAFAEL CA
2006-05-09 415-686-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SAN RAFAEL CA
2006-05-05 415-728-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2006-05-05 415-728-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2006-05-05 415-728-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2006-05-05 415-728-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2006-05-05 415-728-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA
2006-05-05 415-728-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC CNTRL CA

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.