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
2012-05-09 443-425-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PARKVILLE MD
2012-05-09 443-425-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 PARKVILLE MD
2012-05-04 443-239-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2012-05-04 443-239-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
2012-05-04 443-699-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2012-05-04 443-699-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2012-05-04 443-699-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2012-05-04 443-699-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ANNAPOLIS MD
2012-05-04 443-903-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BEL AIR MD
2012-05-04 443-960-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2012-05-02 443-233-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 VIENNA MD
2012-05-02 443-297-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J ARBUTUS MD
2012-04-27 443-315-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J CATONSVL MD
2012-04-27 443-522-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J REISTERSTN MD
2012-04-27 443-595-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J SPARKSGLNC MD
2012-04-27 443-664-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J OCEAN CITY MD
2012-04-23 443-963-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D BALTIMORE MD
2012-04-16 443-741-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 COLUMBIA MD
2012-04-06 443-301-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2012-04-06 443-301-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2012-04-06 443-301-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2012-04-06 443-301-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2012-04-06 443-301-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2012-04-06 443-301-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2012-04-06 443-301-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2012-04-06 443-301-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2012-04-05 443-567-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 BEL AIR MD
2012-04-04 443-439-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TRAPPE MD
2012-04-03 443-651-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE MD
2012-03-27 443-353-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 COCKEYSVL MD
2012-03-14 443-607-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J WEST RIVER MD
2012-03-14 443-979-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2012-03-06 443-437-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 POCOMOKE MD
2012-03-01 443-320-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J BALTIMORE MD
2012-03-01 443-963-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 BALTIMORE MD
2012-02-15 443-219-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PARKVILLE MD
2012-02-13 443-499-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F JARRETTSVL MD
2012-02-08 443-207-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J ELKTON MD
2012-02-06 443-274-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D SEVERN MD
2012-02-06 443-360-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D ABERDEEN MD
2012-02-06 443-364-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D ELLICOTTCY MD
2012-02-06 443-398-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D SYKESVILLE MD
2012-02-06 443-578-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D COCKEYSVL MD
2012-02-06 443-917-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D COLUMBIA MD
2012-02-06 443-991-8XXX 8000–8999Assigned ONVOY, LLC - MD 876D TOWSON MD
2012-02-03 443-201-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WESTMINSTR MD
2012-02-03 443-991-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TOWSON MD
2012-01-31 443-892-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 NEWWINDSOR MD
2012-01-31 443-918-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 TANEYTOWN MD
2012-01-30 443-240-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BALTIMORE 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.