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 570
CTSI, INC. - PA 87
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
2017-05-12 570-284-9XXX 9000–9999Assigned CTSI, INC. - PA 7513 DANVILLE PA
2016-03-31 570-416-8XXX 8000–8999Assigned CTSI, INC. - PA 7513 BLOOMSBURG PA
2014-01-29 570-703-2XXX 2000–2999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2013-05-16 570-703-4XXX 4000–4999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2013-04-23 570-703-5XXX 5000–5999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2013-04-23 570-703-6XXX 6000–6999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2013-04-23 570-703-7XXX 7000–7999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2013-04-23 570-703-8XXX 8000–8999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2013-04-22 570-770-0XXX 0000–0999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2013-04-22 570-770-3XXX 3000–3999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2013-04-22 570-770-4XXX 4000–4999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2012-08-20 570-770-5XXX 5000–5999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2012-08-20 570-770-6XXX 6000–6999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2012-08-20 570-770-7XXX 7000–7999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2012-08-20 570-770-8XXX 8000–8999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2012-08-20 570-770-9XXX 9000–9999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2012-06-18 570-382-5XXX 5000–5999Assigned CTSI, INC. - PA 7513 OLYPHANT PA
2011-07-28 570-415-4XXX 4000–4999Assigned CTSI, INC. - PA 7513 SUNBURY PA
2011-02-28 570-591-9XXX 9000–9999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2010-02-22 570-591-5XXX 5000–5999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2009-09-22 570-266-4XXX 4000–4999Assigned CTSI, INC. - PA 7513 WILKSBARRE PA
2009-03-05 570-861-3XXX 3000–3999Assigned CTSI, INC. - PA 7513 HAZLETON PA
2008-07-25 570-601-5XXX 5000–5999Assigned CTSI, INC. - PA 7513 WILLIAMSPT PA
2007-12-21 570-751-7XXX 7000–7999Assigned CTSI, INC. - PA 7513 HAZLETON PA
2007-09-10 570-517-8XXX 8000–8999Assigned CTSI, INC. - PA 7513 STROUDSBG PA
2007-09-10 570-802-8XXX 8000–8999Assigned CTSI, INC. - PA 7513 BERWICK PA
2007-09-10 570-991-4XXX 4000–4999Assigned CTSI, INC. - PA 7513 WILKSBARRE PA
2007-02-12 570-437-5XXX 5000–5999Assigned CTSI, INC. - PA 7513 WASHIGTNVL PA
2006-12-01 570-702-8XXX 8000–8999Assigned CTSI, INC. - PA 7513 SCRANTON PA
2006-10-30 570-915-1XXX 1000–1999Assigned CTSI, INC. - PA 7513 PINE GROVE PA
2006-10-30 570-968-1XXX 1000–1999Assigned CTSI, INC. - PA 7513 ORWIGSBURG PA
2006-10-16 570-718-4XXX 4000–4999Assigned CTSI, INC. - PA 7513 KINGSTON PA
2006-10-12 570-601-8XXX 8000–8999Assigned CTSI, INC. - PA 7513 WILLIAMSPT PA
2006-10-04 570-225-3XXX 3000–3999Assigned CTSI, INC. - PA 7513 TAMAQUA PA
2006-10-04 570-399-6XXX 6000–6999Assigned CTSI, INC. - PA 7513 MINERSVL PA
2006-10-04 570-593-6XXX 6000–6999Assigned CTSI, INC. - PA 7513 SCHUYLKHVN PA
2006-10-04 570-612-3XXX 3000–3999Assigned CTSI, INC. - PA 7513 SHENANDOAH PA
2006-10-04 570-739-6XXX 6000–6999Assigned CTSI, INC. - PA 7513 FRIEDENSBG PA
2006-10-04 570-754-6XXX 6000–6999Assigned CTSI, INC. - PA 7513 AUBURN PA
2006-10-04 570-783-6XXX 6000–6999Assigned CTSI, INC. - PA 7513 MAHANOY CY PA
2006-10-04 570-794-8XXX 8000–8999Assigned CTSI, INC. - PA 7513 FRACKVILLE PA
2006-10-04 570-818-3XXX 3000–3999Assigned CTSI, INC. - PA 7513 MANTZVILLE PA
2006-10-04 570-929-6XXX 6000–6999Assigned CTSI, INC. - PA 7513 MCADOO PA
2006-10-04 570-943-6XXX 6000–6999Assigned CTSI, INC. - PA 7513 MCKEANSBG PA
2006-10-03 570-246-2XXX 2000–2999Assigned CTSI, INC. - PA 7513 MILTON PA
2006-10-03 570-249-3XXX 3000–3999Assigned CTSI, INC. - PA 7513 JIM THORPE PA
2006-10-03 570-251-2XXX 2000–2999Assigned CTSI, INC. - PA 7513 HONESDALE PA
2006-10-03 570-252-5XXX 5000–5999Assigned CTSI, INC. - PA 7513 NEWFOUNDLD PA
2006-10-03 570-257-3XXX 3000–3999Assigned CTSI, INC. - PA 7513 LORDS VLY PA
2006-10-03 570-273-2XXX 2000–2999Assigned CTSI, INC. - PA 7513 NESQUHONNG PA

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.