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Multicast address

Created: Feb 29, 2020 15:33:14Latest reply: Mar 1, 2020 00:16:12 113 3 0 0
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Hi friends,

I have a basic question.  How are MAC multicast addresses, IPv4 multicast addresses, and IPv6 multicast addresses defined? In other words, how do I know if a MAC/IP address is a multicast address?  Thanks.

  • x
  • convention:

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Admin Created Feb 29, 2020 15:35:23 Helpful(1) Helpful(1)

Hello Sprout,

If the first byte of a MAC address is an odd number, the MAC address is a multicast MAC address. If the value is an even number, it is a unicast MAC address. 

If the first byte of an IPv4 address ranges from 224 to 239 (including 224 and 239), the IPv4 address is an IPv4 multicast address. 

And if the first byte of an IPv6 address is 255, the IPv6 address is an IPv6 multicast address.

Any further questions, let us know.

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  • x
  • convention:

Sprout Created Feb 29, 2020 15:36:23
clear  
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Popeye_Wang Admin Created Feb 29, 2020 15:35:23 Helpful(1) Helpful(1)

Hello Sprout,

If the first byte of a MAC address is an odd number, the MAC address is a multicast MAC address. If the value is an even number, it is a unicast MAC address. 

If the first byte of an IPv4 address ranges from 224 to 239 (including 224 and 239), the IPv4 address is an IPv4 multicast address. 

And if the first byte of an IPv6 address is 255, the IPv6 address is an IPv6 multicast address.

Any further questions, let us know.

View more
  • x
  • convention:

Sprout Created Feb 29, 2020 15:36:23
clear  
lucian2003 MVE Created Mar 1, 2020 00:16:12 Helpful(0) Helpful(0)

Hi, In IPV4
As defined by INA, the most significant 24 bits of IPV4 multicast address are 0x01005e, and the 25th bits is always 0
The least significant 23 bits of a mac address are the least significant 23 bits of a multicast ip address.
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  • x
  • convention:

Hello%20friends%2C%20I%20am%20a%20Telecommunications%20and%20electronics%20engineer%20and%20I%20just%20graduated%20as%20a%20master%20in%20telecommunications%20systems.%20I%20work%20in%20the%20telecommunications%20company%20of%20Cuba%2C%20ETECSA.%20I%20am%2035%20years%20old%20and%20I%20attend%20the%20transport%20network%20in%20my%20province%2C%20which%20is%20mainly%20Huawei.

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