NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 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, all time — NPA 510
COMCAST PHONE OF CALIFORNIA, LLC 113
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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2020-09-20 510-380-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2020-09-20 510-380-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2020-09-20 510-380-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2020-09-20 510-729-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2020-09-20 510-729-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2020-09-20 510-729-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2020-09-18 510-880-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2020-09-18 510-880-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2020-09-18 510-880-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2019-04-11 510-902-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRNK MAIN CA
2019-04-11 510-988-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD FRTVL CA
2018-10-08 510-609-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RICHMOND CA
2018-08-30 510-607-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2018-04-30 510-605-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2018-02-26 510-626-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2018-02-21 510-603-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD FRTVL CA
2017-10-12 510-941-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRNK GRNLF CA
2017-08-31 510-822-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2017-02-21 510-871-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD ALMD CA
2016-12-12 510-941-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRNK GRNLF CA
2016-10-13 510-570-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD BKLY CA
2016-09-21 510-901-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2016-02-11 510-963-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2015-11-24 510-422-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD FRTVL CA
2015-11-12 510-756-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2015-07-17 510-907-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2015-04-14 510-624-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRNK OLIVR CA
2015-04-14 510-779-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ELSBR-PINL CA
2015-02-17 510-844-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2014-12-22 510-771-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRNK OLIVR CA
2014-12-02 510-598-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRNK MAIN CA
2014-08-21 510-876-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2014-07-28 510-833-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD BKLY CA
2014-07-15 510-560-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2014-07-02 510-426-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RICHMOND CA
2014-07-02 510-879-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2013-09-20 510-671-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD ALMD CA
2013-09-09 510-750-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2013-09-06 510-990-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD BKLY CA
2013-08-05 510-808-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2013-08-05 510-957-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2013-05-15 510-866-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD FRTVL CA
2013-05-07 510-573-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRNK OLIVR CA
2013-01-14 510-669-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ELSBR-PINL CA
2013-01-11 510-200-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2012-11-07 510-808-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2011-09-13 510-313-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HRCUL-RODE CA
2011-09-08 510-244-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2011-09-08 510-358-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRNK MAIN CA
2011-09-08 510-878-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID 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.