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 513
CINCINNATI BELL 251
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 125
T-MOBILE USA, INC. 79
NEW CINGULAR WIRELESS PCS, LLC - IL 55
LEVEL 3 COMMUNICATIONS, LLC - OH 39
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
2020-07-10 513-689 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 LEBANON OH
2020-07-01 513-676 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F BETHANY OH
2020-06-24 513-669 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F LTL MIAMI OH
2020-06-02 513-643 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - OH 464C WILLIAMSBG OH
2020-06-02 513-647 0–9 XXXwhole prefix which blocks → ONVOY, LLC - OH 464C MIDDLETOWN OH
2020-05-28 513-995 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OH 464C BETHEL OH
2020-03-31 513-663 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J HAMILTON OH
2020-02-25 513-540 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - OH 464C MIDDLETOWN OH
2020-02-05 513-640 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 LTL MIAMI OH
2019-11-15 513-596 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 HAMILTON OH
2019-10-10 513-810 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H CINCINNATI OH
2019-07-03 513-572 0–9 XXXall 10 · 3 holders which blocks → CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS 600F CINCINNATI OH
2019-03-19 513-866 0–9 XXXall 10 · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J CINCINNATI OH
2019-01-18 513-567 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 MIDDLETOWN OH
2018-12-20 513-993 0–9 XXXall 10 · 5 holders which blocks → HD CARRIER LLC 321J CINCINNATI OH
2018-10-23 513-613 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C MORROW OH
2018-10-22 513-654 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → PEERLESS NETWORK OF OHIO, LLC - OH 284F SO LEBANON OH
2018-09-10 513-799 0–9 XXXall 10 · 2 holders which blocks → INVOXIO INCORPORATED 158H CINCINNATI OH
2018-08-02 513-547 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F TRENTON OH
2018-08-02 513-548 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F MASON OH
2018-07-16 513-953 0–9 XXXall 10 · 4 holders which blocks → WIDE VOICE, LLC - OH 765H HAMILTON OH
2018-05-03 513-538 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D CINCINNATI OH
2018-03-20 513-514 0–9 XXXall 10 · 6 holders which blocks → WIDE VOICE, LLC - OH 765H CINCINNATI OH
2018-02-22 513-506 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF OHIO, LLC - OH 284F MONROE OH
2018-02-02 513-499 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 HAMILTON OH
2018-01-11 513-496 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LEBANON OH
2017-09-29 513-999 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OH 464C CINCINNATI OH
2017-08-24 513-440 0–9 XXXwhole prefix which blocks → ONVOY, LLC - OH 464C CINCINNATI OH
2017-08-18 513-586 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C CINCINNATI OH
2017-07-20 513-416 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 MIDDLETOWN OH
2017-07-19 513-216 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F BETHEL OH
2017-03-10 513-525 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 HAMILTON OH
2017-02-03 513-270 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 FELICITY OH
2016-10-17 513-964 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF OHIO, LLC - OH 284F CINCINNATI OH
2016-08-24 513-597 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEWTONSVL OH
2016-07-26 513-968 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LEBANON OH
2016-03-11 513-974 0–9 XXXwhole prefix which blocks → OHIO BELL TEL CO 9321 MIDDLETOWN OH
2016-02-26 513-466 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OH 464C MASON OH
2016-02-12 513-975 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 CINCINNATI OH
2016-02-01 513-883 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HAMILTON OH
2015-12-16 513-982 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF OHIO, LLC - OH 284F SEVEN MILE OH
2015-11-20 513-854 0–9 XXXwhole prefix which blocks → ONVOY, LLC - OH 464C CINCINNATI OH
2015-11-10 513-952 0–9 XXXall 10 · 3 holders which blocks → CINCINNATI BELL 9348 CINCINNATI OH
2015-10-16 513-973 0–9 XXXall 10 · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K HAMILTON OH
2015-08-28 513-986 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C CLERMONT OH
2015-07-31 513-918 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
2015-07-30 513-987 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F LTL MIAMI OH
2015-06-25 513-996 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
2015-05-22 513-940 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F NEWTONSVL OH
2015-05-19 513-997 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 MIDDLETOWN 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.