NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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, last 30 days — NPA 737
8X8, INC. 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 NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2019-12-23 737-273 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
2019-12-13 737-263 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
2019-10-16 737-262 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 AUSTIN TX
2019-10-09 737-710 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H AUSTIN TX
2019-10-08 737-261 0–9 XXXall 10 · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 AUSTIN TX
2019-09-20 737-259 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 HUTTO TX
2019-09-10 737-244 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F TAYLOR TX
2019-07-26 737-258 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 MILANO TX
2019-07-25 737-500 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C BASTROP TX
2019-07-25 737-510 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C BERTRAM TX
2019-07-25 737-520 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C FENTRESS TX
2019-07-25 737-530 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → ONVOY, LLC - TX 903C LOMETA TX
2019-05-21 737-356 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H GEORGETOWN TX
2019-05-21 737-373 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H SAN MARCOS TX
2019-05-21 737-465 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H AUSTIN TX
2019-05-21 737-758 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H KEMPNER TX
2019-05-21 737-766 0–9 XXXall 10 · 8 holders which blocks → FRACTEL, LLC 965H LEANDER TX
2019-05-02 737-257 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F SANGABRIEL TX
2019-03-19 737-900 0–9 XXXall 10 · 3 holders which blocks → TERRA NOVA TELECOM INC. 145J AUSTIN TX
2019-03-04 737-256 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 AUSTIN TX
2019-03-01 737-255 0–9 XXXall 10 · 5 holders which blocks → EXIANT COMMUNICATIONS LLC 114J AUSTIN TX
2018-11-15 737-253 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D GEORGETOWN TX
2018-10-25 737-251 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF TEXAS, LLC - TX 177F BURNET TX
2018-10-25 737-252 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF TEXAS, LLC - TX 177F LIBERTY HL TX
2018-10-02 737-249 0–9 XXXall 10 · 7 holders which blocks → IP GLOBAL NETWORKS - TX 763H AUSTIN TX
2018-09-27 737-246 0–9 XXXall 10 · 3 holders which blocks → AIRESPRING, INC. 996H AUSTIN TX
2018-08-21 737-637 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C THORNDTHRL TX
2018-08-21 737-727 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - TX 903C MCDADE TX
2018-08-21 737-837 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C TAYLOR TX
2018-08-14 737-239 0–9 XXXall 10 · 5 holders which blocks → VOIP INNOVATIONS, LLC 597F AUSTIN TX
2018-07-09 737-980 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → INVOXIO INCORPORATED 158H COUPLAND TX
2018-07-03 737-770 0–9 XXXall 10 · 5 holders which blocks → INVOXIO INCORPORATED 158H BUDA TX
2018-06-21 737-236 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F AUSTIN TX
2018-06-21 737-238 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F BERTRAM TX
2018-05-22 737-990 0–9 XXXall 10 · 4 holders which blocks → INVOXIO INCORPORATED 158H AUSTIN TX
2018-05-04 737-235 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 AUSTIN TX
2018-05-02 737-234 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F JARRELL TX
2018-03-29 737-233 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ELGIN TX
2018-03-23 737-231 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F AUSTIN TX
2018-03-22 737-471 0–9 XXXall 10 · 2 holders which blocks → SOUTHWESTERN BELL 9533 AUSTIN TX
2018-02-26 737-245 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - TX 903C GEORGETOWN TX
2018-02-26 737-260 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - TX 903C DRIPPNGSPG TX
2018-02-26 737-299 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C LAMPASAS TX
2018-02-22 737-250 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - TX 903C MARTINDALE TX
2018-02-06 737-237 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C AUSTIN TX
2018-01-12 737-230 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX
2017-12-22 737-232 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ELGIN TX
2017-12-11 737-229 0–9 XXXall 10 · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 AUSTIN TX
2017-10-27 737-224 0–9 XXXall 10 · 4 holders which blocks → AUSTIN BESTLINE COMPANY 7551 AUSTIN TX
2017-09-20 737-228 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AUSTIN TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.