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
2006-10-05 443-686-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2006-10-05 443-686-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2006-10-04 443-823-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
2006-10-04 443-883-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2006-10-04 443-896-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2006-10-04 443-896-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2006-10-04 443-907-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 ELKTON MD
2006-10-04 443-944-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2006-10-04 443-944-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2006-10-04 443-974-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WESTMINSTR MD
2006-10-04 443-986-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-10-04 443-986-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-10-04 443-986-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-10-04 443-986-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2006-09-27 443-627-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2006-09-27 443-627-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2006-09-27 443-627-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BALTIMORE MD
2006-09-26 443-330-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J COCKEYSVL MD
2006-09-26 443-688-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J SEVERN MD
2006-09-20 443-304-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARBUTUS MD
2006-09-19 443-966-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2006-09-18 443-870-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J PIKESVILLE MD
2006-09-15 443-304-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARBUTUS MD
2006-09-15 443-405-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J RANDALLSTN MD
2006-09-08 443-869-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2006-09-08 443-869-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2006-09-08 443-869-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2006-09-08 443-869-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2006-09-06 443-327-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J ABERDEEN MD
2006-09-06 443-327-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J ABERDEEN MD
2006-09-06 443-503-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J DUNDALK MD
2006-09-06 443-503-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J DUNDALK MD
2006-09-06 443-752-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BEL AIR MD
2006-09-06 443-883-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 GLENBURNIE MD
2006-09-06 443-896-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 COLUMBIA MD
2006-09-05 443-546-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J COLUMBIA MD
2006-09-05 443-546-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J COLUMBIA MD
2006-08-29 443-935-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2006-08-29 443-935-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2006-08-29 443-935-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
2006-08-29 443-974-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WESTMINSTR MD
2006-08-25 443-330-8XXX 8000–8999Assigned VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
2006-08-24 443-275-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J TOWSON MD
2006-08-23 443-458-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2006-08-23 443-458-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2006-08-23 443-481-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2006-08-23 443-481-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ANNAPOLIS MD
2006-08-23 443-513-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BERLIN MD
2006-08-22 443-213-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 PIKESVILLE MD
2006-08-16 443-909-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 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.