5.21.0.0/16 covers 5.21.0.0 to 5.21.255.255, 65,536 IPv4 addresses. It is announced by AS50010 (Omani Qatari Telecommunication Company SAOC). Every sampled address geolocates to Oman, with 63% in Muscat. It is registered to an internet service provider. 3% of sampled addresses are flagged as proxy.