Notepad File
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Hello,
Don made a nice notepad file describing Class A, B, and C networks in the Introduction to Routing episode. Is that file available for download somewhere?
-Jamie -
Jamie,
Thanks for writing in. I just dug through my notes and I cannot locate that file. I'm not sure what happened with it. However, I just finished making a similar set of notes for our updated Network+ content, so I think that will help. It is pasted below. Please let me know if you need anything else.
Don Pezet
Host, ITProTVIPv4 Current Addressing Protocol Used on Internet 32 Bit Address (4,294,967,296 Addresses) (2^32) As of Feb 2012 no more IPv4 addresses in reserve 32 bit Binary address reported in dotted decimal format. Loopback 127.0.0.0 - 127.255.255.255 Class A 1.0.0.0 - 126.255.255.255 Subnet Mask: 255.0.0.0 00000001 -01111111 (1st digit 0) # Networks: 126 # Hosts per network: 16,777,214 Class B 128.0.0.0 - 191.255.255.255 Subnet Mask: 255.255.0.0 10000000 - 10111111 (1st 2 digits are 10) # Networks: 16,384 # Hosts per network: 65,534 Class C 192.0.0.0 - 223.255.255.255 Subnet Mask 255.255.255.0 11000000 - 11011111 (1st 3 digits are 110) # Networks: 2 million+ # Hosts per network: 254 Class D (Multicast) 224.0.0.0 - 239.255.255.255 Subnet Mask: n/a # Networks: n/a # Hosts per network: n/a Class E (Experimental) 240.0.0.0 -255.255.255.255 Subnet Mask: n/a # Networks: n/a # Hosts per network: n/a Classless - Disregards the class boundaries Classful - Respects the class boundaries First Octets ---------------- A - 0-126 - 0xxxxxxx B - 128-191 - 10xxxxxx C - 192-223 - 110xxxxx RFC 1918 Private Addresses reserved for internal use Not registered with IANA Class A 10.0.0.0 - 10.255.255.255 Subnet Mask: 255.0.0.0 # Networks: 1 # Hosts per network: 16,777,214 Class B 172.16.0.0 - 172.31.255.255 Subnet Mask: 255.240.0.0 # Networks: 16 # Hosts per network: 65,534 Class C 192.168.0.0 - 192.168.255.255 Subnet Mask 255.255.0.0 # Networks: 256 # Hosts per network: 254 APIPA Automatic Private IP Addressing 169.254.0.0 - 169.254.255.255 Mask: 255.255.0.0