Mac Address Assignments

Mac Address Assignments-5
Vendors often possess many prefix numbers associated with their different products.For example, the prefixes , :9C and 68:7F:74 (plus many others) all belong to Linksys (Cisco Systems).The leftmost 6 digits (24 bits) called a "prefix" is associated with the adapter manufacturer (M).

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IP networks manage the conversion between IP and MAC addresses using Address Resolution Protocol (ARP).

The Dynamic Host Configuration Protocol (DHCP) relies on ARP to manage the unique assignment of IP addresses to devices.

If you find any issues, have an idea on what to add or improve on, or just have a question, please let us know by going to our contact page. Since we have been subject to abuse of our API from several large companies and smart phone app creators who have incorrectly implemented our API, we have essentially been DDo Sed for the past few months.

First we would like to thank all our loyal users, especially the ones who have donated!

(and our SSL cert expiring *doh*) We have tested the new site a few times during off-peak hours and the results are extremely promising!

If you would like to help test our beta site, please Contact Us and let us know you are interested in the beta.Note that hardware from different vendors may happen to share the same device portion of the address.While traditional MAC addresses are all 48 bits in length, a few types of networks require 64-bit addresses instead.The manufacturer agrees to give all NICs (and other Ethernet products) a MAC address that begins with its assigned 3-byte OUI.The manufacturer also assigns a unique value for the last 3 bytes, a number that manufacturer has never used with that OUI.The Media Access Control (MAC) address is a binary number used to uniquely identify computer network adapters.These numbers (sometimes called hardware addresses or physical addresses) are embedded into the network hardware during the manufacturing process, or stored in firmware, and designed to not be modified.Instead of 64-bit hardware addresses, though, IPv6 automatically translates 48-bit MAC address to a 64-bit address by inserting a fixed (hardcoded) 16-bit value FFFE in between the vendor prefix and the device identifier.IPv6 calls these numbers identifiers to distinguish them from true 64-bit hardware addresses.We will get back to you with a link when the beta is live.Our current site will continue to operate without the API enabled and once the beta site goes live, all (correct) API queries will be backward compatible with the new website.


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