NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 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, last 30 days — NPA 580
ONVOY, LLC - OK 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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 580-219 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TISHOMINGO OK
— 580-220 0XXX which blocks → SOUTHWESTERN BELL 9533 ARDMORE OK
— 580-221 not yet reported which blocks → SOUTHWESTERN BELL 9533 ARDMORE OK
— 580-223 not yet reported which blocks → SOUTHWESTERN BELL 9533 ARDMORE OK
— 580-224 1XXX7XXX which blocks → SOUTHWESTERN BELL 9533 ARDMORE OK
— 580-225 7XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ELK CITY OK
— 580-226 not yet reported which blocks → SOUTHWESTERN BELL 9533 ARDMORE OK
— 580-227 8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 FAIRVIEW OK
— 580-228 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WAURIKA OK
— 580-229 2XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 HEALDTON OK
— 580-230 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → METROPCS, INC. 5562 DURANT OK
— 580-231 3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ENID OK
— 580-233 not yet reported which blocks → SOUTHWESTERN BELL 9533 ENID OK
— 580-234 not yet reported which blocks → SOUTHWESTERN BELL 9533 ENID OK
— 580-237 not yet reported which blocks → SOUTHWESTERN BELL 9533 ENID OK
— 580-239 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → UNITED STATES CELLULAR - OK 6272 ATOKA OK
— 580-240 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 TEMPLE OK
— 580-241 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 BATTIEST OK
— 580-242 9XXX which blocks → SOUTHWESTERN BELL 9533 ENID OK
— 580-243 0XXX2XXX3XXX4XXX5XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ELK CITY OK
— 580-244 not yet reported which blocks → WINDSTREAM OKLAHOMA, INC. 1965 SMITHVILLE OK
— 580-245 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 IDABEL OK
— 580-246 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 INDIAHOMA OK
— 580-248 not yet reported which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-249 not yet reported which blocks → SOUTHWESTERN BELL 9533 ENID OK
— 580-250 not yet reported which blocks → SOUTHWESTERN BELL 9533 LAWTON OK
— 580-251 6XXX which blocks → SOUTHWESTERN BELL 9533 DUNCAN OK
— 580-252 7XXX which blocks → SOUTHWESTERN BELL 9533 DUNCAN OK
— 580-253 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 ADAMS OK
— 580-254 none assigned yet which blocks → SOUTHWESTERN BELL 9533 WOODWARD OK
— 580-255 not yet reported which blocks → SOUTHWESTERN BELL 9533 DUNCAN OK
— 580-256 not yet reported which blocks → SOUTHWESTERN BELL 9533 WOODWARD OK
— 580-258 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → UNITED STATES CELLULAR - OK 6272 COALGATE OK
— 580-259 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 FLORIS OK
— 580-260 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OK 409F WAUKOMIS OK
— 580-261 not yet reported which blocks → PANHANDLE TELEPHONE COOPERATIVE, INC. 2016 KENTON OK
— 580-262 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BLACKWELL OK
— 580-263 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → UNITED STATES CELLULAR - OK 6272 MADILL OK
— 580-265 1XXX3XXX5XXX6XXX8XXX · 2 holders which blocks → MID-AMERICA TEL., INC. 2010 STONEWALL OK
— 580-266 none assigned yet which blocks → SOUTHWEST OKLAHOMA TEL. CO. 2025 MARTHA OK
— 580-267 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 DEER CREEK OK
— 580-268 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 MARLAND OK
— 580-269 not yet reported which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 KAW CITY OK
— 580-271 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → UNITED STATES CELLULAR - OK 6272 ANTLERS OK
— 580-272 none assigned yet which blocks → SOUTHWESTERN BELL 9533 ADA OK
— 580-273 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 WOODWARD OK
— 580-274 not yet reported which blocks → PIONEER TEL. COOP., INC. 2018 LONGDALE OK
— 580-275 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CLINTON OK
— 580-276 none assigned yet which blocks → SOUTHWESTERN BELL 9533 MARIETTA OK
— 580-277 1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARDMORE OK

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.