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
2018-06-12 681-322 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 5 holders which blocks → VONAGE AMERICA LLC 197D CHRLSTNZN4 WV
2018-05-25 681-455 0–9 XXXall 10 · 9 holders which blocks → VONAGE AMERICA LLC 197D CLARKSBURG WV
2018-05-01 681-385 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN1 WV
2018-04-05 681-662 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WV 077G HARPESFRRY WV
2018-02-06 681-621 1XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 BLUEFIELD WV
2017-11-03 681-344 0–9 XXXall 10 · 2 holders which blocks → FRONTIER WEST VIRGINIA INC. 9214 CHRLSTNZN1 WV
2017-09-29 681-484 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WV 9944 LEWISBURG WV
2017-08-04 681-508 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 WHELNGZON1 WV
2017-05-10 681-339 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WV 080F PIEDMONT WV
2017-05-10 681-667 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WV 080F SHINNSTON WV
2017-04-12 681-353 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → METROPCS, INC. 5562 FALLNGWTRS WV
2017-03-03 681-779 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - WV 080F RIVESVILLE WV
2016-10-17 681-781 0–9 XXXall 10 · 3 holders which blocks → WIDE VOICE, LLC - WV 729H CHRLSTNZN1 WV
2016-09-07 681-249 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MOUNT HOPE WV
2016-08-17 681-247 0–9 XXXall 10 · 8 holders which blocks → SHENTEL COMMUNICATIONS, LLC. - WV 489F MARTINSBG WV
2016-08-02 681-494 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BECKLEY WV
2016-06-29 681-241 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GLENVILLE WV
2015-12-29 681-307 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LOGAN WV
2015-12-24 681-237 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WV 077G PTPLEASANT WV
2015-10-06 681-244 0XXX1XXX2XXX6XXX7XXX8XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J NEWTON WV
2015-10-06 681-377 0XXX1XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J MONTGOMERY WV
2015-09-21 681-337 0XXX1XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WV 9944 WIDEN WV
2015-09-15 681-269 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BIRCHRIVER WV
2015-09-04 681-628 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WV 9944 RICHWOOD WV
2015-09-03 681-578 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J ARNOLDSBG WV
2015-06-30 681-477 0XXX1XXX2XXX4XXX5XXX7XXX · 4 holders which blocks → CSC VOICE, LLC 612K FLEMINGTON WV
2015-06-30 681-525 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → CSC VOICE, LLC 612K FARMINGTON WV
2015-06-26 681-522 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 7 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 WEIRTON WV
2015-04-28 681-587 0–9 XXXall 10 · 2 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J CHRLSTNZN1 WV
2015-02-17 681-368 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BECKLEY WV
2014-12-23 681-842 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER WEST VIRGINIA INC. 9214 BRIDGEPORT WV
2014-10-30 681-256 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - WV 080F WEBSTERSPG WV
2014-10-30 681-303 0XXX3XXX4XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - WV 080F RUPERT WV
2014-10-12 681-399 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → IDT AMERICA, CORP. - WV 317C PARSONS WV
2014-10-06 681-299 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WV 080F FRANKFORD WV
2014-04-04 681-321 0–9 XXXall 10 · 4 holders which blocks → FIBERNET, LLC - WV 4095 SALEM WV
2014-03-05 681-620 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → UNITED STATES CELLULAR - WV 6284 KEYSER WV
2014-03-05 681-668 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHEAT LAKE WV
2014-01-28 681-291 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → CSC VOICE, LLC 612K RAINELLE WV
2014-01-28 681-318 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K LEWISBURG WV
2014-01-28 681-400 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CSC VOICE, LLC 612K WHITESVL WV
2014-01-28 681-422 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K MOUNT HOPE WV
2014-01-28 681-539 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CSC VOICE, LLC 612K SOPHIA WV
2014-01-28 681-612 0–9 XXXall 10 · 8 holders which blocks → CSC VOICE, LLC 612K ST MARYS WV
2014-01-28 681-731 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → CSC VOICE, LLC 612K MILL CREEK WV
2014-01-27 681-233 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K HURRICANE WV
2014-01-27 681-459 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CSC VOICE, LLC 612K GLENDANIEL WV
2014-01-27 681-735 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CSC VOICE, LLC 612K KERMIT WV
2014-01-24 681-236 0XXX1XXX2XXX5XXX8XXX9XXX · 4 holders which blocks → CSC VOICE, LLC 612K ELIZABETH WV
2014-01-24 681-416 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → CSC VOICE, LLC 612K DELBARTON 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.