NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 937
OHIO BELL TEL CO 159
NEW CINGULAR WIRELESS PCS, LLC - IL 73
T-MOBILE USA, INC. 64
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 61
BRIGHTSPEED OF NORTHWEST OHIO, INC. 55
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 NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2017-06-14 937-400 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - OH 464C JACKSONCTR OH
2017-06-01 937-300 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 EATON OH
2017-05-03 937-250 0–9 XXXall 10 · 5 holders which blocks → CINCINNATI BELL EXTENDED TERRITORIES LLC - OH 309B DAYTON OH
2017-03-10 937-724 0XXX1XXX3XXX4XXX6XXX7XXX9XXX · 6 holders which blocks → TELNYX LLC 073H SPRING VLY OH
2017-03-08 937-616 0–9 XXXall 10 · 2 holders which blocks → TELNYX LLC 073H XENIA OH
2017-03-08 937-797 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H BEAVERCREK OH
2017-02-21 937-893 0–9 XXXall 10 · 8 holders which blocks → SIGECOM, LLC DBA WOW INTERNET CABLE AND PHONE 735E MARYSVILLE OH
2017-02-03 937-664 4XXX6XXX · 2 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SABINA OH
2017-02-03 937-735 0XXX1XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J WALEXNDRIA OH
2017-01-27 937-721 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F MAGNETCSPG OH
2016-12-19 937-200 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 FAIRBORN OH
2016-07-26 937-986 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BEAVERCREK OH
2016-07-15 937-807 0XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → WINDSTREAM OHIO, LLC 0665 COVINGTON OH
2016-06-28 937-988 0–9 XXXall 10 · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K BEAVERCREK OH
2016-06-03 937-990 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K XENIA OH
2016-05-25 937-991 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2016-04-29 937-975 0XXX1XXX2XXX3XXX5XXX6XXX9XXX · 5 holders which blocks → PEERLESS NETWORK OF OHIO, LLC - OH 284F WINCHESTER OH
2016-04-07 937-230 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C MILFORDCTR OH
2016-04-07 937-880 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - OH 464C RAYMOND OH
2016-04-07 937-967 1XXX2XXX3XXX4XXX · 2 holders which blocks → ONVOY, LLC - OH 464C MT VICTORY OH
2016-03-30 937-992 0XXX1XXX2XXX3XXX4XXX · 2 holders which blocks → FRONTIER NORTH, INC. - OH 0615 WILMINGTON OH
2016-03-17 937-957 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PEERLESS NETWORK OF OHIO, LLC - OH 284F RIPLEY OH
2016-03-11 937-871 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF OHIO, LLC - OH 284F DANVILLE OH
2016-01-12 937-963 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
2016-01-05 937-980 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF OHIO, LLC - OH 284F TROY OH
2015-10-23 937-993 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2015-07-21 937-951 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2015-06-25 937-994 0XXX2XXX4XXX9XXX · 4 holders which blocks → WINDSTREAM OHIO, LLC 0665 ST PARIS OH
2015-06-01 937-995 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F FAIRBORN OH
2015-05-06 937-956 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F BEAVERCREK OH
2015-05-06 937-998 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F ENGLEWOOD OH
2015-04-09 937-960 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 TROTWOOD OH
2015-02-13 937-972 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF OHIO, LLC - OH 284F DAYTON OH
2015-02-05 937-729 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEWCARLISL OH
2015-02-05 937-782 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BEAVERCREK OH
2014-12-23 937-970 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - OH 464C CEDARVILLE OH
2014-10-23 937-949 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K DAYTON OH
2014-10-16 937-952 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 DAYTON OH
2014-10-10 937-979 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAYTON OH
2014-10-08 937-941 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 NEWCARLISL OH
2014-10-01 937-929 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BEAVERCREK OH
2014-08-25 937-936 0–9 XXXall 10 · 8 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F BOWERSVLLE OH
2014-08-22 937-931 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 DAYTON OH
2014-07-30 937-971 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 XENIA OH
2014-06-19 937-928 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 XENIA OH
2014-05-19 937-915 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J LAURA OH
2014-05-15 937-563 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J PITCHIN OH
2014-05-15 937-870 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NEWLEBANON OH
2014-05-15 937-888 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SO VIENNA OH
2014-05-15 937-908 0–9 XXXall 10 · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SPRING VLY OH

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.