CCSF
AS39961 (CCSF) announces at least 12 prefixes:
208.121.0.0/24
San Francisco Department of Telecommunications and Information Services
1970-01-01
NET-208-121-0-0-1
208.121.0.0-208.121.255.255
208.121.1.0/24
208.121.5.0/24
208.121.6.0/24
208.121.32.0/20
208.121.48.0/20
208.121.64.0/18
208.121.128.0/17
208.121.203.0/24
208.121.224.0/24
208.121.225.0/24
208.121.226.0/23
0