NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 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 773
ONVOY, LLC 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
2004-06-22 773-387-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-06-22 773-387-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-06-22 773-387-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-06-22 773-715-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2004-06-21 773-449-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN09 IL
2004-06-21 773-741-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN11 IL
2004-06-17 773-332-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2004-06-17 773-458-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2004-06-17 773-527-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2004-06-17 773-569-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2004-06-17 773-632-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2004-06-10 773-387-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-06-10 773-387-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-06-10 773-387-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-06-10 773-387-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-06-10 773-387-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-06-10 773-387-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-06-10 773-387-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-06-02 773-314-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2004-06-02 773-314-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2004-05-27 773-799-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2004-05-24 773-537-0XXX 0000–0999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN04 IL
2004-05-24 773-537-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN04 IL
2004-05-24 773-537-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN04 IL
2004-05-24 773-537-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN04 IL
2004-05-24 773-537-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN04 IL
2004-05-24 773-537-9XXX 9000–9999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN04 IL
2004-05-24 773-565-0XXX 0000–0999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN06 IL
2004-05-24 773-565-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN06 IL
2004-05-24 773-565-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN06 IL
2004-05-24 773-565-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN06 IL
2004-05-24 773-565-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN06 IL
2004-05-24 773-565-9XXX 9000–9999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN06 IL
2004-05-12 773-272-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2004-05-12 773-272-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2004-04-28 773-319-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-04-28 773-319-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-04-28 773-319-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-04-19 773-243-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2004-04-19 773-243-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2004-04-19 773-715-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2004-04-19 773-715-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2004-04-16 773-304-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 IL
2004-04-16 773-304-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 IL
2004-04-16 773-304-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 IL
2004-04-16 773-314-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 IL
2004-04-15 773-319-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-04-15 773-319-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-04-15 773-319-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-04-15 773-319-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL

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.