81.91.128.0/23 covers 81.91.128.0 to 81.91.129.255, 512 IPv4 addresses. It is announced by AS25124 (Datak Company LLC). Every sampled address geolocates to Iran, with 100% in Tehran. 50% of it is registered to a business. None of the sampled addresses are flagged as VPN, proxy or Tor.