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IPv4 - Subnetting made easy

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Table Of Content

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IPv4 - Subnetting made easy

Publisher: Psychz Networks,  January 05,2015

This How-to charts will help anyone seeking to know the Gateway, netmask, available IP address you can use on a specific IPV4 subnet.

Example: 23.238.0.8/29

  1. The CDIR chart tells me the netmask for this /29 is 255.255.255.248
  2. The /29 Subnet charts tell me that .8/29 gateway is .9 meaning that my gateway is 23.238.0.9
  3. The /29 Subnet chart has 10-14 as the vailable IP address for this /29, so 5 usable IP.

This chart removes the broadcast IP as it's not needed on a VLAN setup like ours. Howeve the last IP address + 1 would be the broadcast address. example 10-14 + 1 = 15 would be the broadcast address

CIDR chart

CIDR Addresses Hosts Netmask Amount of Class C
/30 4 2 255.255.255.252 1/64
/29 8 6 255.255.255.248 1/32
/28 16 14 255.255.255.240 1/16
/27 32 30 255.255.255.224 1/8
/26 64 62 255.255.255.192 1/4
/25 128 126 255.255.255.128 1/2
/24 256 254 255.255.255.0 1
/23 512 510 255.255.254.0 2
/22 1024 1022 255.255.252.0 4
/21 2048 2046 255.255.248.0 8
/20 4096 4094 255.255.240.0 16
/19 8192 8190 255.255.224.0 32
/18 16384 16382 255.255.192.0 64
/17 32768 32766 255.255.128.0 128
/16 65536 65534 255.255.0.0 256

/25 Subnet -- 126 Hosts

Network Gateway Host

0 1 2-126
128 129 130-254

/26 Subnet -- 62 Hosts

Network Gateway Host

.0 .1 .2-62
.64 .65 .66-126
.128 .129 .130.190
.192 .193 .194-254

/27 Subnet -- 30 Hosts

Network Gateway Host

0 1 2-30
32 33 34-62
64 65 66-94
96 97 98-126
128 129 130-158
160 161 162-190
192 193 194-222
224 225 226-254

/28 Subnet -- 14 Hosts

Network Gateway Host

0 1 2-14
16 17 18-30
32 33 34-46
48 49 50-62
64 65 66-78
80 81 82-94
96 97 98-110
112 113 114-126
128 129 130-142
144 145 146-158
160 161 162-174
176 177 178-190
192 193 194-206
208 209 210-222
224 225 226-238
240 241 242-254

/29 Subnet-- 6 Hosts

Network Gateway Host

0 1 2-6
8 9 10-14
16 17 18-22
24 25 26-30
32 33 34-38
40 41 42-46
48 49 50-54
56 57 58-62
64 65 66-70
72 73 74-78
80 81 82-86
88 89 90-94
96 97 98-102
104 105 106-110
112 113 114-118
120 121 122-126
128 129 130-134
136 136 138-142
144 145 146-150
152 153 154-158
160 161 162-166
168 169 170-174
176 177 178-182
184 185 186-190
192 193 194-198
200 201 202-206
208 209 210-214
216 217 218-222
224 225 226-230
232 233 234-238
240 241 242-246
248 249 250-254

Related Articles

  • Setup VPN on CentOS 8
  • Data Center Redundancy: N+1
  • What is the difference between Latency, Bandwidth and Throughput?
  • How To Point A Domain Name To An IP Address
  • How to do a speed test using Psychz looking glass?
  • Quagga Routing - Install, Configure and setup BGP
  • Guide to establish a GRE Tunnel and BGP peering session on MikroTik RouterOS
  • Common Types of Network Attacks
  • Community Strings For Psychz Networks
  • Centos add virtual IP(s)
  • Views: (10031)
  • Votes: (0)
Was this article helpful?
VOTE
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