Saturday, March 8th, 2008 I won't get into a whole subnetting lesson here but, if you already know subnetting, then you'll know exactly what these charts are and what they mean.I find them very helpful to have around. It saves lots of precious time.
Class A Subnetting# bits
Subnet Mask
CIDR
# Subnets
# Hosts
Nets * Hosts2
255.192.0.0
/10
2
4194302
83886043
255.224.0.0
/11
6
2097150
125829004
255.240.0.0
/12
14
1048574
146800365
255.248.0.0
/13
30
524286
157285806
255.252.0.0
/14
62
262142
162528047
255.254.0.0
/15
126
131070
165148208
255.255.0.0
/16
254
65534
166456369
255.255.128.0
/17
510
32766
1671066010
255.255.192.0
/18
1022
16382
1674240411
255.255.224.0
/19
2046
8190
1675674012
255.255.240.0
/20
4094
4094
1676083613
255.255.248.0
/21
8190
2046
1675674014
255.255.252.0
/22
16382
1022
1674240415
255.255.254.0
/23
32766
510
1671066016
255.255.255.0
/24
65534
254
1664563617
255.255.255.128
/25
131070
126
1651482018
255.255.255.192
/26
262142
62
1625280419
255.255.255.224
/27
524286
30
1572858020
255.255.255.240
/28
1048574
14
1468003621
255.255.255.248
/29
2097150
6
1258290022
255.255.255.252
/30
4194302
2
8388604Class B Subnetting# ...
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Saturday, March 8th, 2008 Anti-virus technologies are inconsistent when it comes to identifying attacks such as worms, phishing and botnets.That's according to a report from the University of Michigan's Electrical Engineering and Computer Science Department and network security company Arbor Networks, antivirus products are inconsistent at best when it comes to identifying attacks such ...
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Saturday, March 8th, 2008 The arrest of Robert Soloway, the so-called "Spam King" who commanded a botnet of zombies that reportedly sent out billions of spam email messages every day, is a case study in just how difficult killing a botnet can be. His capture does not equate to the release of thousands of ...
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Saturday, March 8th, 2008 If you haven't changed the default password on your home router, do so now.That's what researchers at Symantec and Indiana University are saying, after publishing the results of tests that show how attackers could take over your home router using malicious JavaScript code.For the attack to work, the bad guys ...
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Saturday, March 8th, 2008 Microsoft is working on a new tunneling protocol for Vista and Longhorn that will provide secure network access from anywhere on the Net.The Secure Socket Tunneling Protocol (SSTP) creates a VPN tunnel that travels over Secure-HTTP, eliminating issues associated VPN connections based on the Point-to-Point Tunneling Protocol (PPTP) or Layer ...
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