NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 580-278 0XXX2XXX3XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ENID OK
— 580-279 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → METROPCS, INC. 5562 ADA OK
— 580-280 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LAWTON OK
— 580-281 none assigned yet which blocks → SANTA ROSA TEL COOP INC 2141 RANDLETT OK
— 580-283 not yet reported which blocks → CHEROKEE TEL. CO. 1979 ACHILLE OK
— 580-284 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LAWTON OK
— 580-285 not yet reported which blocks → CHEROKEE TEL. CO. 1979 YUBA OK
— 580-286 not yet reported which blocks → SOUTHWESTERN BELL 9533 IDABEL OK
— 580-287 none assigned yet which blocks → SOUTHWEST OKLAHOMA TEL. CO. 2025 WILLOW OK
— 580-288 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - OK 409F KREMLIN OK
— 580-289 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - OK 409F RINGLING OK
— 580-293 not yet reported which blocks → KANOKLA TEL ASSN 1788 SOHARDTNER OK

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.