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, 09/21/2026

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 878
CORE COMMUNICATIONS, INC. - PA 41
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
2020-03-27 878-678-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BADEN PA
2019-04-09 878-202-1XXX 1000–1999Assigned CORE COMMUNICATIONS, INC. - PA 3806 SHARON PA
2019-04-09 878-202-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 SHARON PA
2019-04-09 878-202-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 SHARON PA
2019-04-09 878-202-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 SHARON PA
2019-04-09 878-202-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 SHARON PA
2019-04-09 878-202-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 SHARON PA
2019-04-09 878-202-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 SHARON PA
2019-04-09 878-202-9XXX 9000–9999Assigned CORE COMMUNICATIONS, INC. - PA 3806 SHARON PA
2019-03-19 878-837-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 BENTLEYVL PA
2019-03-13 878-257-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 TAYLORSTN PA
2019-03-13 878-257-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 TAYLORSTN PA
2019-03-13 878-666-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MARION CTR PA
2019-03-13 878-666-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MARION CTR PA
2019-03-13 878-666-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MARION CTR PA
2019-03-08 878-238-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LIGONIER PA
2019-03-08 878-238-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LIGONIER PA
2019-03-08 878-238-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LIGONIER PA
2019-03-08 878-238-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 LIGONIER PA
2019-03-07 878-258-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 FREEPORT PA
2019-03-07 878-258-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 FREEPORT PA
2019-03-07 878-258-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 FREEPORT PA
2019-03-07 878-258-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC. - PA 3806 FREEPORT PA
2019-02-13 878-266-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 ELDERTON PA
2019-02-04 878-228-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 UNIONTOWN PA
2019-02-04 878-266-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 ELDERTON PA
2018-06-14 878-222-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 NEWWLMNGTN PA
2018-06-14 878-222-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC. - PA 3806 NEWWLMNGTN PA
2018-06-14 878-355-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 UNIONTOWN PA
2018-06-14 878-355-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 UNIONTOWN PA
2018-06-14 878-355-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 UNIONTOWN PA
2018-06-14 878-439-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 ROCHESTER PA
2018-05-23 878-425-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 SAXONBURG PA
2018-05-23 878-425-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 SAXONBURG PA
2018-05-23 878-888-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PARKWOOD PA
2018-05-23 878-888-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC. - PA 3806 PARKWOOD PA
2018-05-22 878-378-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 WESTNEWTON PA
2018-05-22 878-378-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 WESTNEWTON PA
2018-05-22 878-378-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC. - PA 3806 WESTNEWTON PA
2018-05-22 878-666-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MARION CTR PA
2018-05-22 878-666-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC. - PA 3806 MARION CTR PA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.