NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

17 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, last 30 days — NPA 443
ONVOY, LLC - MD 8
NEW CINGULAR WIRELESS PCS, LLC - DC 4
VERSATEL LLC 1
OPENTACT INC. 1
LEVEL 3 COMMUNICATIONS, LLC - MD 1
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
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
2014-05-09 443-720-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ABERDEEN MD
2014-05-07 443-265-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FORK MD
2014-05-07 443-354-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GLENBURNIE MD
2014-05-07 443-402-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F EDGEWOOD MD
2014-05-07 443-402-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F EDGEWOOD MD
2014-05-07 443-402-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F EDGEWOOD MD
2014-05-07 443-410-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GLENBURNIE MD
2014-05-07 443-448-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 DENTON MD
2014-05-07 443-584-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CROFTON MD
2014-05-07 443-685-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J SEVERN MD
2014-05-02 443-410-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2014-05-02 443-410-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2014-05-01 443-410-0XXX 0000–0999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G GLENBURNIE MD
2014-04-28 443-808-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2014-04-28 443-808-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2014-04-28 443-808-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2014-04-28 443-808-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2014-04-28 443-808-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2014-04-28 443-808-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2014-04-23 443-808-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J ANNAPOLIS MD
2014-04-21 443-646-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J NORTHBEACH MD
2014-04-17 443-566-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J CHESAPKECY MD
2014-04-11 443-784-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ARGRGBSNIS MD
2014-04-11 443-784-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ARGRGBSNIS MD
2014-04-11 443-784-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ARGRGBSNIS MD
2014-04-08 443-808-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ANNAPOLIS MD
2014-04-08 443-808-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ANNAPOLIS MD
2014-04-02 443-877-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NORTH EAST MD
2014-03-28 443-317-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F CHASE MD
2014-03-24 443-429-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J WOODLAWN MD
2014-03-10 443-505-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ESSEX 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

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.