Yes, that IP is part of the multicasting group.
Here’s a quick blurb from Cisco regarding IGMP/Multicasting:
"[i]Multicast routing is a bandwidth conserving technology that reduces traffic by simultaneously delivering a single stream of information to potentially thousands of corporate recipients and homes. Applications that take advantage of multicast include video conferencing, corporate communications, distance learning, and distribution of software, stock quotes, and news.
Multicast routing allows a host to send packets to a subset of all hosts as a group transmission rather than to a single host, as in unicast transmission, or to all hosts, as in broadcast transmission. The subset of hosts is known as group members and they are identified by a single multicast group address that falls under the IP Class D address range from 224.0.0.0 through 239.255.255.255.[/i]"
Apparently, some routers use multicasting as a way to conserve bandwith; not sure how (I’m not that technical) but the article this quote is from relates to setting up a Cisco router for multicasting, and some of the benefits thereof.
If you’re unsure of it, you can always do this:
Go to Security/Advanced/Miscellaneous, and move the Alert Frequency slider to High or Very High. Uncheck “Do not show alerts for applications certified by Comodo.” Reboot your computer. This will obviously prompt a lot of popups (you can turn it back down after you’re satisfied you know what’s going on), but it will show IP, application, etc on each attempt. This will help you track down exactly what is causing the IGMP traffic.
You may find it’s svchost.exe, and thus probably safe, or some other known application that you choose to allow. Or you may decide you don’t want to see it any more and block it all entirely… (if it causes you problems, you can reverse the block).
Try that out, if you like, and see what kind of results that gives you.
LM