Windows 7 - Multicast streams help

Help
I was playing around with multicast addresses and used "arp -a" command and received the following list:

192.168.1.1 00-24-37-87-11-b0 dynamic
192.168.1.13 00-14-94-01-07-db dynamic
192.168.1.33 00-1f-41-04-f4-50 dynamic
192.168.1.37 00-1c-ea-ae-c8-14 dynamic
192.168.1.42 00-1d-60-d0-aa-02 dynamic
192.168.1.46 00-23-ee-da-d3-ff dynamic
192.168.1.65 00-1f-41-04-d6-50 dynamic
192.168.1.255 ff-ff-ff-ff-ff-ff static
224.0.0.2 01-00-5e-00-00-02 static
224.0.0.22 01-00-5e-00-00-16 static
224.0.0.251 01-00-5e-00-00-fb static
224.0.0.252 01-00-5e-00-00-fc static
224.0.0.253 01-00-5e-00-00-fd static
233.49.26.100 01-00-5e-31-1a-64 static
233.49.26.101 01-00-5e-31-1a-65 static
233.49.26.102 01-00-5e-31-1a-66 static
233.49.26.104 01-00-5e-31-1a-68 static
233.49.26.105 01-00-5e-31-1a-69 static
etc......................................................................

All well and good

BUT after an overnight reboot of my system I couldn't repeat the listing view
I'm probably a great dummy but it would be great if someone could help me to reproduce the above.

etc.................