NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 970
QWEST CORPORATION 189
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2020-04-15 970-740 0–9 XXXall 10 · 6 holders which blocks → QWEST CORPORATION 9636 STERLING CO
2016-09-02 970-652 0–9 XXXall 10 · 3 holders which blocks → QWEST CORPORATION 9636 GREELEY CO
2015-12-11 970-271 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9636 GRAND JCT CO
2015-01-14 970-821 0–9 XXXall 10 · 4 holders which blocks → QWEST CORPORATION 9636 FT COLLINS CO
2015-01-09 970-810 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9636 GREELEY CO
2015-01-09 970-820 0–9 XXXall 10 · 4 holders which blocks → QWEST CORPORATION 9636 LOVELAND CO
2008-04-21 970-665 0–9 XXXall 10 · 8 holders which blocks → QWEST CORPORATION 9636 RIFLE CO
2007-05-30 970-924 0–9 XXXall 10 · 3 holders which blocks → QWEST CORPORATION 9636 ASPEN CO
2007-05-01 970-237 0–9 XXXall 10 · 4 holders which blocks → QWEST CORPORATION 9636 FT COLLINS CO
2006-03-14 970-624 0–9 XXXall 10 · 5 holders which blocks → QWEST CORPORATION 9636 LOVELAND CO
2005-05-23 970-488 0–9 XXXall 10 · 4 holders which blocks → QWEST CORPORATION 9636 FT COLLINS CO
2005-02-04 970-298 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9636 GRAND JCT CO
2002-08-28 970-492 5XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 FT COLLINS CO
2002-06-17 970-764 0–9 XXXall 10 · 3 holders which blocks → QWEST CORPORATION 9636 DURANGO CO
2001-09-14 970-683 0XXX1XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 GRAND JCT CO
2001-01-16 970-205 9XXX which blocks → QWEST CORPORATION 9636 ASPEN CO
— 970-203 none assigned yet which blocks → QWEST CORPORATION 9636 LOVELAND CO
— 970-204 not yet reported which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-206 none assigned yet which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-207 not yet reported which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-221 not yet reported which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-223 not yet reported which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-224 not yet reported which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-225 5XXX which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-226 not yet reported which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-229 not yet reported which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-240 not yet reported which blocks → QWEST CORPORATION 9636 MONTROSE CO
— 970-241 not yet reported which blocks → QWEST CORPORATION 9636 GRAND JCT CO
— 970-242 not yet reported which blocks → QWEST CORPORATION 9636 GRAND JCT CO
— 970-243 not yet reported which blocks → QWEST CORPORATION 9636 GRAND JCT CO
— 970-244 not yet reported which blocks → QWEST CORPORATION 9636 GRAND JCT CO
— 970-245 not yet reported which blocks → QWEST CORPORATION 9636 GRAND JCT CO
— 970-247 not yet reported which blocks → QWEST CORPORATION 9636 DURANGO CO
— 970-248 not yet reported which blocks → QWEST CORPORATION 9636 GRAND JCT CO
— 970-249 not yet reported which blocks → QWEST CORPORATION 9636 MONTROSE CO
— 970-251 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → QWEST CORPORATION 9636 CRESTEDBTE CO
— 970-252 not yet reported which blocks → QWEST CORPORATION 9636 MONTROSE CO
— 970-253 none assigned yet which blocks → QWEST CORPORATION 9631 SO SIDNEY CO
— 970-254 not yet reported which blocks → QWEST CORPORATION 9636 GRAND JCT CO
— 970-255 not yet reported which blocks → QWEST CORPORATION 9636 GRAND JCT CO
— 970-256 not yet reported which blocks → QWEST CORPORATION 9636 GRAND JCT CO
— 970-257 not yet reported which blocks → QWEST CORPORATION 9636 GRAND JCT CO
— 970-259 not yet reported which blocks → QWEST CORPORATION 9636 DURANGO CO
— 970-262 not yet reported which blocks → QWEST CORPORATION 9636 DILLON CO
— 970-263 not yet reported which blocks → QWEST CORPORATION 9636 GRAND JCT CO
— 970-266 not yet reported which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-267 not yet reported which blocks → QWEST CORPORATION 9636 FT COLLINS CO
— 970-276 0XXX6XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 HAYDEN CO
— 970-278 3XXX5XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9636 LOVELAND CO
— 970-282 not yet reported which blocks → QWEST CORPORATION 9636 FT COLLINS CO

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.