IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)172.16.2.0/24

network172.16.2.0/24

broadcast172.16.2.255

first host172.16.2.1

last host172.16.2.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classB

ipcalc 172.16.2.0/24

address10101100.00010000.00000010.00000000

subnet mask11111111.11111111.11111111.00000000

network10101100.00010000.00000010.00000000

broadcast10101100.00010000.00000010.11111111

green = network part, grey = host part

hex0xac100200

decimal2886730240

reverse dns0.2.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:200

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	172.16.2.0/31	172.16.2.0 – 172.16.2.1	172.16.2.1
2	172.16.2.2/31	172.16.2.2 – 172.16.2.3	172.16.2.3
3	172.16.2.4/31	172.16.2.4 – 172.16.2.5	172.16.2.5
4	172.16.2.6/31	172.16.2.6 – 172.16.2.7	172.16.2.7
5	172.16.2.8/31	172.16.2.8 – 172.16.2.9	172.16.2.9
6	172.16.2.10/31	172.16.2.10 – 172.16.2.11	172.16.2.11
7	172.16.2.12/31	172.16.2.12 – 172.16.2.13	172.16.2.13
8	172.16.2.14/31	172.16.2.14 – 172.16.2.15	172.16.2.15
9	172.16.2.16/31	172.16.2.16 – 172.16.2.17	172.16.2.17
10	172.16.2.18/31	172.16.2.18 – 172.16.2.19	172.16.2.19
11	172.16.2.20/31	172.16.2.20 – 172.16.2.21	172.16.2.21
12	172.16.2.22/31	172.16.2.22 – 172.16.2.23	172.16.2.23
13	172.16.2.24/31	172.16.2.24 – 172.16.2.25	172.16.2.25
14	172.16.2.26/31	172.16.2.26 – 172.16.2.27	172.16.2.27
15	172.16.2.28/31	172.16.2.28 – 172.16.2.29	172.16.2.29
16	172.16.2.30/31	172.16.2.30 – 172.16.2.31	172.16.2.31
17	172.16.2.32/31	172.16.2.32 – 172.16.2.33	172.16.2.33
18	172.16.2.34/31	172.16.2.34 – 172.16.2.35	172.16.2.35
19	172.16.2.36/31	172.16.2.36 – 172.16.2.37	172.16.2.37
20	172.16.2.38/31	172.16.2.38 – 172.16.2.39	172.16.2.39
21	172.16.2.40/31	172.16.2.40 – 172.16.2.41	172.16.2.41
22	172.16.2.42/31	172.16.2.42 – 172.16.2.43	172.16.2.43
23	172.16.2.44/31	172.16.2.44 – 172.16.2.45	172.16.2.45
24	172.16.2.46/31	172.16.2.46 – 172.16.2.47	172.16.2.47
25	172.16.2.48/31	172.16.2.48 – 172.16.2.49	172.16.2.49
26	172.16.2.50/31	172.16.2.50 – 172.16.2.51	172.16.2.51
27	172.16.2.52/31	172.16.2.52 – 172.16.2.53	172.16.2.53
28	172.16.2.54/31	172.16.2.54 – 172.16.2.55	172.16.2.55
29	172.16.2.56/31	172.16.2.56 – 172.16.2.57	172.16.2.57
30	172.16.2.58/31	172.16.2.58 – 172.16.2.59	172.16.2.59
31	172.16.2.60/31	172.16.2.60 – 172.16.2.61	172.16.2.61
32	172.16.2.62/31	172.16.2.62 – 172.16.2.63	172.16.2.63
33	172.16.2.64/31	172.16.2.64 – 172.16.2.65	172.16.2.65
34	172.16.2.66/31	172.16.2.66 – 172.16.2.67	172.16.2.67
35	172.16.2.68/31	172.16.2.68 – 172.16.2.69	172.16.2.69
36	172.16.2.70/31	172.16.2.70 – 172.16.2.71	172.16.2.71
37	172.16.2.72/31	172.16.2.72 – 172.16.2.73	172.16.2.73
38	172.16.2.74/31	172.16.2.74 – 172.16.2.75	172.16.2.75
39	172.16.2.76/31	172.16.2.76 – 172.16.2.77	172.16.2.77
40	172.16.2.78/31	172.16.2.78 – 172.16.2.79	172.16.2.79
41	172.16.2.80/31	172.16.2.80 – 172.16.2.81	172.16.2.81
42	172.16.2.82/31	172.16.2.82 – 172.16.2.83	172.16.2.83
43	172.16.2.84/31	172.16.2.84 – 172.16.2.85	172.16.2.85
44	172.16.2.86/31	172.16.2.86 – 172.16.2.87	172.16.2.87
45	172.16.2.88/31	172.16.2.88 – 172.16.2.89	172.16.2.89
46	172.16.2.90/31	172.16.2.90 – 172.16.2.91	172.16.2.91
47	172.16.2.92/31	172.16.2.92 – 172.16.2.93	172.16.2.93
48	172.16.2.94/31	172.16.2.94 – 172.16.2.95	172.16.2.95
49	172.16.2.96/31	172.16.2.96 – 172.16.2.97	172.16.2.97
50	172.16.2.98/31	172.16.2.98 – 172.16.2.99	172.16.2.99
51	172.16.2.100/31	172.16.2.100 – 172.16.2.101	172.16.2.101
52	172.16.2.102/31	172.16.2.102 – 172.16.2.103	172.16.2.103
53	172.16.2.104/31	172.16.2.104 – 172.16.2.105	172.16.2.105
54	172.16.2.106/31	172.16.2.106 – 172.16.2.107	172.16.2.107
55	172.16.2.108/31	172.16.2.108 – 172.16.2.109	172.16.2.109
56	172.16.2.110/31	172.16.2.110 – 172.16.2.111	172.16.2.111
57	172.16.2.112/31	172.16.2.112 – 172.16.2.113	172.16.2.113
58	172.16.2.114/31	172.16.2.114 – 172.16.2.115	172.16.2.115
59	172.16.2.116/31	172.16.2.116 – 172.16.2.117	172.16.2.117
60	172.16.2.118/31	172.16.2.118 – 172.16.2.119	172.16.2.119
61	172.16.2.120/31	172.16.2.120 – 172.16.2.121	172.16.2.121
62	172.16.2.122/31	172.16.2.122 – 172.16.2.123	172.16.2.123
63	172.16.2.124/31	172.16.2.124 – 172.16.2.125	172.16.2.125
64	172.16.2.126/31	172.16.2.126 – 172.16.2.127	172.16.2.127
65	172.16.2.128/31	172.16.2.128 – 172.16.2.129	172.16.2.129
66	172.16.2.130/31	172.16.2.130 – 172.16.2.131	172.16.2.131
67	172.16.2.132/31	172.16.2.132 – 172.16.2.133	172.16.2.133
68	172.16.2.134/31	172.16.2.134 – 172.16.2.135	172.16.2.135
69	172.16.2.136/31	172.16.2.136 – 172.16.2.137	172.16.2.137
70	172.16.2.138/31	172.16.2.138 – 172.16.2.139	172.16.2.139
71	172.16.2.140/31	172.16.2.140 – 172.16.2.141	172.16.2.141
72	172.16.2.142/31	172.16.2.142 – 172.16.2.143	172.16.2.143
73	172.16.2.144/31	172.16.2.144 – 172.16.2.145	172.16.2.145
74	172.16.2.146/31	172.16.2.146 – 172.16.2.147	172.16.2.147
75	172.16.2.148/31	172.16.2.148 – 172.16.2.149	172.16.2.149
76	172.16.2.150/31	172.16.2.150 – 172.16.2.151	172.16.2.151
77	172.16.2.152/31	172.16.2.152 – 172.16.2.153	172.16.2.153
78	172.16.2.154/31	172.16.2.154 – 172.16.2.155	172.16.2.155
79	172.16.2.156/31	172.16.2.156 – 172.16.2.157	172.16.2.157
80	172.16.2.158/31	172.16.2.158 – 172.16.2.159	172.16.2.159
81	172.16.2.160/31	172.16.2.160 – 172.16.2.161	172.16.2.161
82	172.16.2.162/31	172.16.2.162 – 172.16.2.163	172.16.2.163
83	172.16.2.164/31	172.16.2.164 – 172.16.2.165	172.16.2.165
84	172.16.2.166/31	172.16.2.166 – 172.16.2.167	172.16.2.167
85	172.16.2.168/31	172.16.2.168 – 172.16.2.169	172.16.2.169
86	172.16.2.170/31	172.16.2.170 – 172.16.2.171	172.16.2.171
87	172.16.2.172/31	172.16.2.172 – 172.16.2.173	172.16.2.173
88	172.16.2.174/31	172.16.2.174 – 172.16.2.175	172.16.2.175
89	172.16.2.176/31	172.16.2.176 – 172.16.2.177	172.16.2.177
90	172.16.2.178/31	172.16.2.178 – 172.16.2.179	172.16.2.179
91	172.16.2.180/31	172.16.2.180 – 172.16.2.181	172.16.2.181
92	172.16.2.182/31	172.16.2.182 – 172.16.2.183	172.16.2.183
93	172.16.2.184/31	172.16.2.184 – 172.16.2.185	172.16.2.185
94	172.16.2.186/31	172.16.2.186 – 172.16.2.187	172.16.2.187
95	172.16.2.188/31	172.16.2.188 – 172.16.2.189	172.16.2.189
96	172.16.2.190/31	172.16.2.190 – 172.16.2.191	172.16.2.191
97	172.16.2.192/31	172.16.2.192 – 172.16.2.193	172.16.2.193
98	172.16.2.194/31	172.16.2.194 – 172.16.2.195	172.16.2.195
99	172.16.2.196/31	172.16.2.196 – 172.16.2.197	172.16.2.197
100	172.16.2.198/31	172.16.2.198 – 172.16.2.199	172.16.2.199
101	172.16.2.200/31	172.16.2.200 – 172.16.2.201	172.16.2.201
102	172.16.2.202/31	172.16.2.202 – 172.16.2.203	172.16.2.203
103	172.16.2.204/31	172.16.2.204 – 172.16.2.205	172.16.2.205
104	172.16.2.206/31	172.16.2.206 – 172.16.2.207	172.16.2.207
105	172.16.2.208/31	172.16.2.208 – 172.16.2.209	172.16.2.209
106	172.16.2.210/31	172.16.2.210 – 172.16.2.211	172.16.2.211
107	172.16.2.212/31	172.16.2.212 – 172.16.2.213	172.16.2.213
108	172.16.2.214/31	172.16.2.214 – 172.16.2.215	172.16.2.215
109	172.16.2.216/31	172.16.2.216 – 172.16.2.217	172.16.2.217
110	172.16.2.218/31	172.16.2.218 – 172.16.2.219	172.16.2.219
111	172.16.2.220/31	172.16.2.220 – 172.16.2.221	172.16.2.221
112	172.16.2.222/31	172.16.2.222 – 172.16.2.223	172.16.2.223
113	172.16.2.224/31	172.16.2.224 – 172.16.2.225	172.16.2.225
114	172.16.2.226/31	172.16.2.226 – 172.16.2.227	172.16.2.227
115	172.16.2.228/31	172.16.2.228 – 172.16.2.229	172.16.2.229
116	172.16.2.230/31	172.16.2.230 – 172.16.2.231	172.16.2.231
117	172.16.2.232/31	172.16.2.232 – 172.16.2.233	172.16.2.233
118	172.16.2.234/31	172.16.2.234 – 172.16.2.235	172.16.2.235
119	172.16.2.236/31	172.16.2.236 – 172.16.2.237	172.16.2.237
120	172.16.2.238/31	172.16.2.238 – 172.16.2.239	172.16.2.239
121	172.16.2.240/31	172.16.2.240 – 172.16.2.241	172.16.2.241
122	172.16.2.242/31	172.16.2.242 – 172.16.2.243	172.16.2.243
123	172.16.2.244/31	172.16.2.244 – 172.16.2.245	172.16.2.245
124	172.16.2.246/31	172.16.2.246 – 172.16.2.247	172.16.2.247
125	172.16.2.248/31	172.16.2.248 – 172.16.2.249	172.16.2.249
126	172.16.2.250/31	172.16.2.250 – 172.16.2.251	172.16.2.251
127	172.16.2.252/31	172.16.2.252 – 172.16.2.253	172.16.2.253
128	172.16.2.254/31	172.16.2.254 – 172.16.2.255	172.16.2.255

01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	subnet mask	addresses	hosts	in your /24
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	-
/21	255.255.248.0	2,048	2,046	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	-
/24	255.255.255.0	256	254	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 split →

02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →