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No matter which device you have, if it comes up with a network interface, you can grab all associated details with its unique identifier. MAC search and verification become more accessible with our advanced tool. Validate MAC Address or Find MAC Vendor for Free The database consists of a list of MAC addresses of all devices manufactured till today. 5-bits = 32 possible IP addresses that map to the same multicast MAC address.MAC Lookup tool searches your MAC Address or OUI in the MAC Address Vendor Database. The first 9-bits are not mapped to the MAC address, but you know that multicast IP addresses always start with 1110 as the first 4-bits so there is actually 5-bits that aren't mapped to the MAC address. So if you follow the procedure, let's say we put 01-00-5E in binary:Ġ0000001 00000000 01011110, then the 25th bit is 0 and the last 23-bits are the last 23-bits of your IP multicast address ( I put them in bold characters.) The result in binary :Ġ0000001 00000000 01011110 00000001 00000001 00000001 = 01-00-5E-01-01-01Īs you can see they have the same last 23-bits so they map to the same multicast MAC address. It says in the guide, that you have to take first the 24-bit IANA's multicast OUI which is 01-00-5E, the 25th bit is zero and the bottom 23 bits are your last 23 bits of your multicast IP address. Basically, you can map 32 different multicast IP addresses to the same multicast MAC address which means in your case, 224.1.1.1 and 226.129.1.1 both map to the 01-00-5E-01-01-01 multicast MAC address. Take a look at this website, it will explain you how to map multicast IP addresses to multicast MAC addresses. All opinions stated are those of the poster only, and do not reflect the opinion of Cisco Systems Inc., or its affiliates. NOTE: The "Reddit Cisco Ring", its associates, subreddits, and creator "mechman991" are not endorsed, sponsored, or officially associated with Cisco Systems Inc. Looking for work? check out /r/NetworkingJobs.Wireshark - For studying packets as they appear on the wire *FREE.Cisco Modeling Labs (CML) - Cisco's Network Simulator ($200/yr).EVE-NG - Another network simulator (FREE & Paid Options).GNS3 - The network simulator that every network person should have *FREE.Free Packet Tracer Download - *FREE WITH SIGNUP.Networking Fundamentals - Learn the very core of Networking.Cisco's Learning Network - Look here no matter what you do.Packet Life Cheat Sheets - Don't forget to thank /u/stretch85 and remind him to update his sheets.
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