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
2016-11-18 443-675-5XXX 5000–5999Assigned BARR TELL USA, INC. 964H RANDALLSTN MD
2016-11-18 443-689-3XXX 3000–3999Assigned BARR TELL USA, INC. 964H COCKEYSVL MD
2016-11-18 443-698-0XXX 0000–0999Assigned BARR TELL USA, INC. 964H ODENTON MD
2016-11-18 443-775-4XXX 4000–4999Assigned BARR TELL USA, INC. 964H ANNAPOLIS MD
2016-11-18 443-780-7XXX 7000–7999Assigned BARR TELL USA, INC. 964H WOODLAWN MD
2016-11-18 443-795-7XXX 7000–7999Assigned BARR TELL USA, INC. 964H SEVERN MD
2016-11-11 443-373-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J OCEAN CITY MD
2016-11-11 443-819-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BEL AIR MD
2016-11-11 443-935-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2016-11-10 443-646-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J NORTHBEACH MD
2016-11-09 443-883-2XXX 2000–2999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2016-11-09 443-883-7XXX 7000–7999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GLENBURNIE MD
2016-11-09 443-998-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 PARKVILLE MD
2016-11-08 443-988-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J CENTREVL MD
2016-11-02 443-590-6XXX 6000–6999Assigned METROPCS, INC. 5562 REISTERSTN MD
2016-11-02 443-754-3XXX 3000–3999Assigned METROPCS, INC. 5562 SALISBURY MD
2016-11-01 443-649-4XXX 4000–4999Assigned METROPCS, INC. 5562 SPARROWSPT MD
2016-11-01 443-685-8XXX 8000–8999Assigned METROPCS, INC. 5562 SEVERN MD
2016-10-31 443-230-6XXX 6000–6999Assigned METROPCS, INC. 5562 ODENTON MD
2016-09-26 443-334-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PIKESVILLE MD
2016-09-22 443-439-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TRAPPE MD
2016-09-22 443-441-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GLENWOOD MD
2016-09-22 443-448-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DENTON MD
2016-09-21 443-645-6XXX 6000–6999Assigned ONVOY, LLC - MD 876D MILLERSVL MD
2016-09-16 443-715-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J NORTH EAST MD
2016-09-15 443-430-1XXX 1000–1999Assigned IP HORIZON LLC 515J COLUMBIA MD
2016-09-15 443-456-5XXX 5000–5999Assigned IP HORIZON LLC 515J EDGEWOOD MD
2016-09-15 443-461-7XXX 7000–7999Assigned IP HORIZON LLC 515J PARKVILLE MD
2016-09-15 443-530-2XXX 2000–2999Assigned IP HORIZON LLC 515J DUNDALK MD
2016-09-15 443-541-6XXX 6000–6999Assigned IP HORIZON LLC 515J COCKEYSVL MD
2016-09-15 443-584-8XXX 8000–8999Assigned IP HORIZON LLC 515J CROFTON MD
2016-09-15 443-594-9XXX 9000–9999Assigned IP HORIZON LLC 515J SPARROWSPT MD
2016-09-15 443-650-2XXX 2000–2999Assigned IP HORIZON LLC 515J REISTERSTN MD
2016-09-15 443-652-9XXX 9000–9999Assigned IP HORIZON LLC 515J TOWSON MD
2016-09-15 443-657-1XXX 1000–1999Assigned IP HORIZON LLC 515J RANDALLSTN MD
2016-09-15 443-685-7XXX 7000–7999Assigned IP HORIZON LLC 515J SEVERN MD
2016-09-14 443-430-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 COLUMBIA MD
2016-09-14 443-430-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 COLUMBIA MD
2016-09-14 443-935-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2016-09-14 443-935-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2016-09-08 443-706-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CRISFIELD MD
2016-09-07 443-572-2XXX 2000–2999Assigned METROPCS, INC. 5562 GLENBURNIE MD
2016-09-02 443-210-5XXX 5000–5999Assigned METROPCS, INC. 5562 SALISBURY MD
2016-09-02 443-210-6XXX 6000–6999Assigned METROPCS, INC. 5562 SALISBURY MD
2016-08-22 443-516-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SYKESVILLE MD
2016-08-22 443-545-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F COLUMBIA MD
2016-08-19 443-819-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J BEL AIR MD
2016-08-09 443-230-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ODENTON MD
2016-08-09 443-334-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F PIKESVILLE MD
2016-08-09 443-568-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F ARBUTUS 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.