I'd throttle the FCC. What is their internal IP block?
FCCNET2 (NET-192-133-125-0-1) 192.133.125.0 - 192.133.125.255
FCCNET (NET-192-104-54-0-1) 192.104.54.0 - 192.104.54.255
FCC2-126-30 (NET-4-21-126-0-1) 4.21.126.0 - 4.21.126.255
FCC (NET6-2620-610-1) 2620:0:610:: - 2620:0:610:FFFF:FFFF:FFFF:FFFF:FFFF
SPRINTLINK (NET-208-23-64-0-1) 208.23.64.0 - 208.23.64.127
TBD (NET6-2600-803-230-1) 2600:803:230:: - 2600:803:230:FFFF:FFFF:FFFF:FFFF:FFFF
Q0503-65-125-25-64 (NET-65-125-25-64-1) 65.125.25.64 - 65.125.25.127
A simple (probably flawed) example: "Oh hey, I found this pastebin with the FCC's IP block, don't know where it came from"