NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 302
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 244
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 60
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
2024-12-11 302-673-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MILFORD DE
2023-03-10 302-571-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILMINGTON DE
2022-09-20 302-412-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 LEWES DE
2022-08-05 302-618-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEW CASTLE DE
2022-02-17 302-802-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 SMYRNA DE
2021-10-11 302-592-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 CAMDEN DE
2021-08-10 302-688-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILMINGTON DE
2021-08-10 302-688-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILMINGTON DE
2021-08-10 302-688-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILMINGTON DE
2021-08-10 302-688-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILMINGTON DE
2020-09-22 302-991-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 NEW CASTLE DE
2020-02-05 302-485-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILMINGTON DE
2019-03-14 302-485-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILMINGTON DE
2018-12-19 302-639-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEW CASTLE DE
2018-12-07 302-485-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILMINGTON DE
2018-06-06 302-318-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWARK DE
2018-06-05 302-608-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DOVER DE
2018-03-07 302-301-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWARK DE
2018-03-07 302-301-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWARK DE
2018-03-07 302-301-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWARK DE
2018-03-07 302-301-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWARK DE
2018-03-07 302-301-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWARK DE
2018-03-07 302-301-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWARK DE
2018-03-07 302-301-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWARK DE
2018-03-07 302-301-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWARK DE
2018-03-07 302-301-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWARK DE
2018-03-07 302-301-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWARK DE
2018-02-08 302-434-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILMINGTON DE
2017-11-03 302-291-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 LEWES DE
2017-05-11 302-274-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILMINGTON DE
2017-05-11 302-274-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILMINGTON DE
2017-05-11 302-274-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILMINGTON DE
2017-05-11 302-274-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILMINGTON DE
2017-05-11 302-274-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WILMINGTON DE
2017-02-28 302-884-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 WILMINGTON DE
2016-11-30 302-601-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 DELAWARECY DE
2016-09-22 302-608-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 DOVER DE
2016-04-27 302-244-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 DOVER DE
2015-08-10 302-501-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 NEW CASTLE DE
2015-07-09 302-318-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 NEWARK DE
2015-07-09 302-516-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 WILMINGTON DE
2015-05-14 302-696-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 MIDDLETOWN DE
2015-03-18 302-259-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 GEORGETOWN DE
2015-03-18 302-516-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 WILMINGTON DE
2015-03-18 302-516-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 WILMINGTON DE
2015-03-18 302-516-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 WILMINGTON DE
2015-03-18 302-516-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 WILMINGTON DE
2015-03-18 302-516-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 WILMINGTON DE
2014-06-13 302-746-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 HOLLY OAK DE
2014-05-28 302-318-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 NEWARK DE

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.