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And does "20:32:33:c9:42:56" mean anything?

It means "Shenzhen Bilian Electronic Co.,Ltd", if you type the first 3 octets of that address (the "OUI") into the Wireshark OUI lookup tool.

Shenzhen Bilian Electronic Co.,Ltd "is a professional network communication equipment research and development, production and sales, and is committed to the Internet of Things, Internet, smart home, smart community, smart city network hardware, software and services, carrying industry 4.0 wireless mobile communications High-tech communication company for network terminal products and module development.".

There's probably something on your network that they made; perhaps it's spewing out lots of SSDP packets because it has the usual high quality-with-a-capital-KW networking firmware/software found on embedded devices.