On Comcast here in San Francisco, some of the sub-channels are carried, while others are not. What determines which ones get carried and which ones don't, I don't know. There are 18 that are carried on Comcast in SD: 170-Decades KPIX 5.2, 171-CCTV KICU 36.3, 172-Sino KCNS 38.2, 173-Viet Today KTSF 26.5, 186-Cozi KNTV 11.2, 187-Antenna TV KRON 4.3, 188-LATV KTVU 2.2, 189-PBS Life KQEH 54-3, 190-PBS World KQED 9.3, 191-PBS V-me KQEH 54.5, 192-PBS Kids KQEH 54.4, 193-SkyTV KRON 4.2, 194-Exitos KSTS 48.2, 196-MeTV KOFY 20.2, 197-??? - was KBS KTSF 26.4 - but it's gone now, 198-France24 KCSM 60.2, 199-Jazz KCSM 60.3, and 201-PBS Create KRCB 22.2, plus one in HD: 715-Live Well KGO 7.2.