NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

3 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 681
NEW CINGULAR WIRELESS PCS, LLC - DC 3
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
2021-04-24 681-610 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WV 449F CLARKSBURG WV
2021-04-24 681-910 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WV 449F CHRLSTNZN1 WV
2021-04-14 681-363 0XXX1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN5 WV
2021-04-02 681-837 0–9 XXXall 10 · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ROCK CAVE WV
2021-03-24 681-361 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PRKRSBGZN1 WV
2021-03-23 681-369 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MULLENS WV
2021-03-23 681-374 0XXX1XXX3XXX4XXX5XXX6XXX · 4 holders which blocks → TELNYX LLC 073H BLUEWELL WV
2021-03-08 681-354 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WV 080F FOLLANSBEE WV
2021-02-24 681-356 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - WV 080F HNTNGTNZN1 WV
2021-02-24 681-357 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - WV 080F LOGAN WV
2021-02-22 681-895 0–9 XXXall 10 · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J CHRLSTNZN1 WV
2021-02-09 681-306 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HNTNGTNZN1 WV
2021-02-04 681-310 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H INWOOD WV
2021-01-28 681-618 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WV 449F WHELNGZON3 WV
2021-01-28 681-660 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WV 449F PRKRSBGZN1 WV
2021-01-15 681-267 0XXX2XXX9XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 MOOREFIELD WV
2021-01-15 681-274 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - WV 080F SPENCER WV
2020-12-07 681-445 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WV 449F PRKRSBGZN2 WV
2020-11-24 681-223 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WV 449F NEWCUMBRLD WV
2020-11-24 681-585 0XXX3XXX5XXX6XXX8XXX · 4 holders which blocks → ONVOY, LLC - WV 449F MIDDLEBORN WV
2020-11-24 681-595 0XXX1XXX2XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → ONVOY, LLC - WV 449F EAST BANK WV
2020-11-24 681-695 0XXX1XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → ONVOY, LLC - WV 449F LUMBERPORT WV
2020-11-24 681-699 0XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - WV 449F PADEN CITY WV
2020-11-24 681-771 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - WV 449F ATHENS WV
2020-11-24 681-821 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - WV 449F WILLIAMSON WV
2020-11-24 681-822 0XXX1XXX2XXX3XXX4XXX9XXX · 4 holders which blocks → ONVOY, LLC - WV 449F WESTON WV
2020-11-24 681-887 4XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - WV 449F THOMAS WV
2020-11-23 681-676 1XXX2XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - WV 449F SALEM WV
2020-11-23 681-776 0XXX2XXX6XXX7XXX · 2 holders which blocks → ONVOY, LLC - WV 449F ARBOVALE WV
2020-11-10 681-362 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HNTNGTNZN1 WV
2020-10-23 681-301 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WV 449F FAYETTEVL WV
2020-10-23 681-671 0XXX1XXX2XXX3XXX6XXX7XXX · 4 holders which blocks → ONVOY, LLC - WV 449F GRIFITHSVL WV
2020-10-23 681-685 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WV 449F GASSAWAY WV
2020-10-19 681-295 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - WV 080F PRKRSBGZN1 WV
2020-10-15 681-655 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → ONVOY, LLC - WV 449F CHRLSTNZN7 WV
2020-10-13 681-324 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → HD CARRIER LLC 321J CLENDENIN WV
2020-10-02 681-349 0–9 XXXall 10 · 5 holders which blocks → HD CARRIER LLC 321J MORGANTOWN WV
2020-09-28 681-677 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - WV 449F CHARLES TN WV
2020-09-24 681-347 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WV 9944 HNTNGTNZN1 WV
2020-09-14 681-317 0–9 XXXall 10 · 3 holders which blocks → IP HORIZON LLC 515J CHRLSTNZN1 WV
2020-09-14 681-331 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J MORGANTOWN WV
2020-09-14 681-338 1XXX3XXX7XXX8XXX9XXX · 5 holders which blocks → IP HORIZON LLC 515J BLUEFIELD WV
2020-09-01 681-327 0–9 XXXall 10 · 7 holders which blocks → NUSO, LLC 478J WHELNGZON1 WV
2020-08-17 681-286 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HNTNGTNZN1 WV
2020-08-07 681-336 2XXX8XXX · 2 holders which blocks → FRACTEL, LLC 965H SMITHVILLE WV
2020-08-07 681-346 0XXX3XXX6XXX7XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H MASON WV
2020-08-07 681-899 2XXX9XXX · 2 holders which blocks → FRACTEL, LLC 965H ROCKPORT WV
2020-08-07 681-946 0XXX3XXX4XXX6XXX8XXX · 4 holders which blocks → FRACTEL, LLC 965H IAEGER WV
2020-08-07 681-966 2XXX6XXX · 2 holders which blocks → FRACTEL, LLC 965H LAWFORD WV
2020-06-25 681-326 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PRKRSBGZN1 WV

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.