NumberResearch Membership · Data 09/21/2026

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 631
CENTURYLINK COMMUNICATIONS, LLC 51
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
2015-07-17 631-715-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CENTRAISLP NY
2014-05-01 631-500-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WATER MILL NY
2014-05-01 631-684-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WESTHAMPTN NY
2014-05-01 631-929-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WADING RIV NY
2014-04-09 631-408-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J AMITYVILLE NY
2014-04-08 631-268-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SOUTHAMPTN NY
2014-04-08 631-296-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BRIDGEMPTN NY
2014-04-08 631-354-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MATTITUCK NY
2014-04-08 631-378-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SHOREHAM NY
2014-04-08 631-407-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SOUTHOLD NY
2014-04-08 631-430-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J GREENPORT NY
2014-04-08 631-443-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J EASTPORT NY
2014-04-08 631-483-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MONTAUK PT NY
2014-04-08 631-502-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J JAMESPORT NY
2014-04-08 631-515-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SHELTER IS NY
2014-04-08 631-529-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ORIENT NY
2014-04-08 631-596-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J QUOGUE NY
2014-04-08 631-658-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J E HAMPTON NY
2014-04-08 631-735-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PECONIC NY
2014-04-08 631-808-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SAG HARBOR NY
2014-04-08 631-856-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HAMPTNBAYS NY
2014-04-03 631-250-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ST JAMES NY
2014-04-03 631-307-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PATCHOGUE NY
2014-04-03 631-318-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J AMAGANSETT NY
2014-04-03 631-341-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J YAPHANK NY
2014-04-03 631-364-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J STONYBROOK NY
2014-04-03 631-400-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CTRMORICHS NY
2014-04-03 631-437-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FIREISLAND NY
2014-04-03 631-490-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ATLANTIC NY
2014-04-03 631-510-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MIDLAND NY
2014-04-03 631-526-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BABYLON NY
2014-04-03 631-600-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J W COMMACK NY
2014-04-03 631-633-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BELLPORT NY
2014-04-03 631-670-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COMMACK NY
2014-04-03 631-840-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ISLIP NY
2014-04-03 631-868-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BAYPORT NY
2014-04-03 631-925-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NORTHPORT NY
2014-04-03 631-973-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J KINGS PARK NY
2014-04-02 631-461-9XXX 9000–9999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RIVERHEAD NY
2014-04-02 631-538-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SELDEN NY
2014-04-02 631-573-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SAYVILLE NY
2014-04-02 631-743-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PTJEFFERSN NY
2013-12-16 631-863-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SMITHTOWN NY
2013-11-15 631-432-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BRENTWOOD NY
2013-11-15 631-450-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LINDENHST NY
2013-11-15 631-518-1XXX 1000–1999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BAY SHORE NY
2013-11-15 631-930-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CENTRAISLP NY
2013-11-13 631-542-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RONKONKOMA NY
2013-11-11 631-257-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SMITHTOWN NY
2013-06-26 631-918-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DEER PARK NY

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.