AS17621China Unicom Shanghai network

ChinaRegistryAPNICTypeCarrier

As of 11th November 2026, AS17621 (China Unicom Shanghai network), a transit carrier registered in China with APNIC, originates 384 IPv4 prefixes covering 1.3M addresses and 426 IPv6 prefixes. By IPv4 address space that makes it the 391st-largest of the 80,747 networks we see originating IPv4, and the 30th-largest of 617 in China. It is seen behind 2 upstream networks, most often AS4837 (China Unicom Backbone) and AS9929 (China Unicom Industrial Internet…), and in front of 40 downstream networks. 98% of its announcements have a valid RPKI ROA; 6 are RPKI-invalid. 84% of its routes reach at least 90% of full-feed peers, and 124 prefixes are also originated by another network.