Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Martha, OK

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
580-266 A MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 0 MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 1 MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 2 MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 3 MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 5 MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 6 MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 7 MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 8 MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-266 9 MRTHOKXADS0  2025 SOUTHWEST OKLAHOMA TEL. CO. 536      
580-843 A ENIDOKKI0MD  6272 UNITED STATES CELLULAR - OK 536      
580-843 0 ENIDOKKI0MD  6272 UNITED STATES CELLULAR - OK 536      
580-843 1   5562 METROPCS, INC. 536   2025-05-08   
580-843 3   6529 T-MOBILE USA, INC. 536   2025-05-05   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.