I haven’t, to my knowledge, allocated a static IP to anything.

I was trying to reserve IP addresses in the router, in the hope this would avoid static IP.

Do these still have to be outside the range of DHCP, then?

I was surprised the Oppo was using an IP I had previously reserved for my NAS, which has a different MAC address…

Sorry, I’m really not good with networking!

HC: 861v4/ID40/LPS, DSP5000, DSP5000VC, DSP3100, SW1600, HD621, Oppo BDP-105, Sony VPL-HW55ES
2-Channel: Oppo BDP-105, TEAC VRDS-7/Trichord Clock 3/PSU, 551, Quad 303, Harbeth Compact 7ES-3, Kimber cables, Russ Andrews mains and supports.
Previous Meridian: 5000C, 5200SL, 7200.2, 6000, 562V.2, 568.2mm, 800v4, 808.2i, 818v2/v3, 861v8, 502