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 443
CENTURYLINK COMMUNICATIONS, LLC 52
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
2018-09-24 443-936-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ELKRIDGE MD
2014-05-27 443-230-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ODENTON MD
2014-05-27 443-256-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NORTH EAST MD
2014-05-27 443-273-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J REISTERSTN MD
2014-05-27 443-297-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ARBUTUS MD
2014-05-27 443-328-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SYKESVILLE MD
2014-05-27 443-331-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TANEYTOWN MD
2014-05-27 443-338-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPARKSGLNC MD
2014-05-27 443-342-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SOLOMONS MD
2014-05-27 443-408-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SPARROWSPT MD
2014-05-27 443-489-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CHASE MD
2014-05-27 443-502-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HAVREGRACE MD
2014-05-27 443-565-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RANDALLSTN MD
2014-05-27 443-578-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COCKEYSVL MD
2014-05-27 443-584-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CROFTON MD
2014-05-27 443-599-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SEVERN MD
2014-05-27 443-648-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ESSEX MD
2014-05-27 443-770-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ARGRGBSNIS MD
2014-05-27 443-776-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ELKRIDGE MD
2014-05-27 443-828-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ELLICOTTCY MD
2014-05-27 443-906-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SEVERNA PK MD
2014-05-23 443-247-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J UNION BDG MD
2014-05-23 443-663-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WOODLAWN MD
2014-05-23 443-914-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WORTHINGTN MD
2014-05-14 443-227-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PT DEPOSIT MD
2014-05-14 443-238-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PARKTON MD
2014-05-14 443-265-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FORK MD
2014-05-14 443-339-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SHERWD FOR MD
2014-05-14 443-347-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CARDIFF MD
2014-05-14 443-412-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CHURCHVL MD
2014-05-14 443-441-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J GLENWOOD MD
2014-05-14 443-494-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MILLERSVL MD
2014-05-14 443-499-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J JARRETTSVL MD
2014-05-14 443-585-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DARLINGTON MD
2014-05-14 443-593-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ELKTON MD
2014-05-14 443-601-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FALLSTON MD
2014-05-14 443-639-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HAMPSTEAD MD
2014-05-14 443-646-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NORTHBEACH MD
2014-05-14 443-647-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J NEWWINDSOR MD
2014-05-14 443-947-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PERRYVILLE MD
2014-03-06 443-201-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WESTMINSTR MD
2014-03-06 443-251-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CATONSVL MD
2014-03-06 443-384-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PARKVILLE MD
2014-03-06 443-399-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DUNDALK MD
2014-03-06 443-501-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PIKESVILLE MD
2014-03-06 443-620-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WATERLO238 MD
2014-03-06 443-787-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BEL AIR MD
2014-03-06 443-792-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BRYNPKLNCM MD
2013-08-05 443-402-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J EDGEWOOD MD
2013-08-05 443-699-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ANNAPOLIS MD

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.