Wednesday 24 June 2020

Network address table

When I am working with infrastructure techs at various customers, I often need to explain how subnetting is done in Azure, why you should do it and also how network addressing works. 

I have been inspired to create a network addressing cheat sheet where I can read the different address spaces available.

/24

255.255.255.0

/25

255.255.255.128

/26

255.255.255.192

/27

255.255.255.224

/28

255.255.255.240

/29

255.255.255.252

256 addresses

251 in Azure

128 addresses

123 in Azure

64 addresses

59 in Azure

32 addresses

27 in Azure

16 addresses

11 in Azure

8 addresses

3 in Azure

0 – 255

0 – 127

0 – 63

0 – 31

0 – 15

0 – 7

8 – 15

16 – 31

16 – 23

24 – 31

32 – 63

32 – 47

32 – 39

40 – 47

48 – 63

48 – 55

56 – 63

64 – 127

64 – 95

64 – 79

64 – 71

72 – 79

80 – 95

80 – 87

88 – 95

96 – 127

96 – 111

96 – 103

104 – 111

112 – 127

112 – 119

120 – 127

128 – 255

128 – 191

128 – 159

128 – 143

128 – 135

136 – 143

144 – 159

144 – 151

152 – 159

160 – 191

160 – 175

160 – 167

168 – 175

176 – 191

176 – 183

184 – 191

192 – 255

192 – 223

192 – 207

192 – 199

200 – 207

208 – 223

208 – 215

216 – 223

224 – 255

224 – 239

224 – 231

232 – 239

240 – 255

240 – 247

248 – 255


I often use this table for visualizing which network addresses are available in different address scopes.