NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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, all time — NPA 510
PACIFIC BELL 31
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
2014-02-03 510-987-5XXX 5000–5999Assigned PACIFIC BELL 9740 OKLD MN-PD CA
2012-11-30 510-454-1XXX 1000–1999Assigned PACIFIC BELL 9740 OKLD TRNID CA
2012-11-30 510-454-2XXX 2000–2999Assigned PACIFIC BELL 9740 OKLD TRNID CA
2012-11-30 510-454-3XXX 3000–3999Assigned PACIFIC BELL 9740 OKLD TRNID CA
2012-11-30 510-454-4XXX 4000–4999Assigned PACIFIC BELL 9740 OKLD TRNID CA
2012-11-30 510-454-5XXX 5000–5999Assigned PACIFIC BELL 9740 OKLD TRNID CA
2012-11-30 510-454-6XXX 6000–6999Assigned PACIFIC BELL 9740 OKLD TRNID CA
2012-11-30 510-454-7XXX 7000–7999Assigned PACIFIC BELL 9740 OKLD TRNID CA
2012-01-13 510-294-1XXX 1000–1999Assigned PACIFIC BELL 9740 HAYWARD CA
2012-01-13 510-294-2XXX 2000–2999Assigned PACIFIC BELL 9740 HAYWARD CA
2012-01-13 510-294-3XXX 3000–3999Assigned PACIFIC BELL 9740 HAYWARD CA
2012-01-13 510-294-4XXX 4000–4999Assigned PACIFIC BELL 9740 HAYWARD CA
2012-01-13 510-294-5XXX 5000–5999Assigned PACIFIC BELL 9740 HAYWARD CA
2012-01-13 510-294-6XXX 6000–6999Assigned PACIFIC BELL 9740 HAYWARD CA
2012-01-13 510-294-7XXX 7000–7999Assigned PACIFIC BELL 9740 HAYWARD CA
2009-11-25 510-408-0XXX 0000–0999Assigned PACIFIC BELL 9740 ELSBR-PINL CA
2009-11-25 510-408-1XXX 1000–1999Assigned PACIFIC BELL 9740 ELSBR-PINL CA
2009-11-25 510-408-2XXX 2000–2999Assigned PACIFIC BELL 9740 ELSBR-PINL CA
2009-11-25 510-408-3XXX 3000–3999Assigned PACIFIC BELL 9740 ELSBR-PINL CA
2009-11-25 510-408-4XXX 4000–4999Assigned PACIFIC BELL 9740 ELSBR-PINL CA
2009-11-25 510-408-5XXX 5000–5999Assigned PACIFIC BELL 9740 ELSBR-PINL CA
2007-11-28 510-356-1XXX 1000–1999Assigned PACIFIC BELL 9740 OKLD BKLY CA
2007-11-28 510-356-9XXX 9000–9999Assigned PACIFIC BELL 9740 OKLD BKLY CA
2002-06-28 510-248-1XXX 1000–1999Assigned PACIFIC BELL 9740 FRNK MAIN CA
2002-06-28 510-248-2XXX 2000–2999Assigned PACIFIC BELL 9740 FRNK MAIN CA
2002-06-28 510-248-3XXX 3000–3999Assigned PACIFIC BELL 9740 FRNK MAIN CA
2002-06-28 510-248-5XXX 5000–5999Assigned PACIFIC BELL 9740 FRNK MAIN CA
2002-06-28 510-248-6XXX 6000–6999Assigned PACIFIC BELL 9740 FRNK MAIN CA
2002-06-28 510-248-7XXX 7000–7999Assigned PACIFIC BELL 9740 FRNK MAIN CA
2002-06-28 510-248-8XXX 8000–8999Assigned PACIFIC BELL 9740 FRNK MAIN CA
2002-04-17 510-243-4XXX 4000–4999Assigned PACIFIC BELL 9740 ELSBR-PINL CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.