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SSDP replies from 192.168.1.1. What exactly is at this ip address?

When I send a crafted ssdp request packet with ssdp:all to 239.255.255.250, an address 192.168.1.1 replies with a bunch of HTTP 1.1 OK ssdp messages(captured on Wireshark). Are these ssdp services that this device at that address is offering? What is at this address because I’ve seen it around in other home networks as well.