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)172.16.3.0/24

network172.16.3.0/24

broadcast172.16.3.255

first host172.16.3.1

last host172.16.3.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classB

ipcalc 172.16.3.0/24

address10101100.00010000.00000011.00000000

subnet mask11111111.11111111.11111111.00000000

network10101100.00010000.00000011.00000000

broadcast10101100.00010000.00000011.11111111

green = network part, grey = host part

hex0xac100300

decimal2886730496

reverse dns0.3.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:300

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	172.16.3.0/31	172.16.3.0 – 172.16.3.1	172.16.3.1
2	172.16.3.2/31	172.16.3.2 – 172.16.3.3	172.16.3.3
3	172.16.3.4/31	172.16.3.4 – 172.16.3.5	172.16.3.5
4	172.16.3.6/31	172.16.3.6 – 172.16.3.7	172.16.3.7
5	172.16.3.8/31	172.16.3.8 – 172.16.3.9	172.16.3.9
6	172.16.3.10/31	172.16.3.10 – 172.16.3.11	172.16.3.11
7	172.16.3.12/31	172.16.3.12 – 172.16.3.13	172.16.3.13
8	172.16.3.14/31	172.16.3.14 – 172.16.3.15	172.16.3.15
9	172.16.3.16/31	172.16.3.16 – 172.16.3.17	172.16.3.17
10	172.16.3.18/31	172.16.3.18 – 172.16.3.19	172.16.3.19
11	172.16.3.20/31	172.16.3.20 – 172.16.3.21	172.16.3.21
12	172.16.3.22/31	172.16.3.22 – 172.16.3.23	172.16.3.23
13	172.16.3.24/31	172.16.3.24 – 172.16.3.25	172.16.3.25
14	172.16.3.26/31	172.16.3.26 – 172.16.3.27	172.16.3.27
15	172.16.3.28/31	172.16.3.28 – 172.16.3.29	172.16.3.29
16	172.16.3.30/31	172.16.3.30 – 172.16.3.31	172.16.3.31
17	172.16.3.32/31	172.16.3.32 – 172.16.3.33	172.16.3.33
18	172.16.3.34/31	172.16.3.34 – 172.16.3.35	172.16.3.35
19	172.16.3.36/31	172.16.3.36 – 172.16.3.37	172.16.3.37
20	172.16.3.38/31	172.16.3.38 – 172.16.3.39	172.16.3.39
21	172.16.3.40/31	172.16.3.40 – 172.16.3.41	172.16.3.41
22	172.16.3.42/31	172.16.3.42 – 172.16.3.43	172.16.3.43
23	172.16.3.44/31	172.16.3.44 – 172.16.3.45	172.16.3.45
24	172.16.3.46/31	172.16.3.46 – 172.16.3.47	172.16.3.47
25	172.16.3.48/31	172.16.3.48 – 172.16.3.49	172.16.3.49
26	172.16.3.50/31	172.16.3.50 – 172.16.3.51	172.16.3.51
27	172.16.3.52/31	172.16.3.52 – 172.16.3.53	172.16.3.53
28	172.16.3.54/31	172.16.3.54 – 172.16.3.55	172.16.3.55
29	172.16.3.56/31	172.16.3.56 – 172.16.3.57	172.16.3.57
30	172.16.3.58/31	172.16.3.58 – 172.16.3.59	172.16.3.59
31	172.16.3.60/31	172.16.3.60 – 172.16.3.61	172.16.3.61
32	172.16.3.62/31	172.16.3.62 – 172.16.3.63	172.16.3.63
33	172.16.3.64/31	172.16.3.64 – 172.16.3.65	172.16.3.65
34	172.16.3.66/31	172.16.3.66 – 172.16.3.67	172.16.3.67
35	172.16.3.68/31	172.16.3.68 – 172.16.3.69	172.16.3.69
36	172.16.3.70/31	172.16.3.70 – 172.16.3.71	172.16.3.71
37	172.16.3.72/31	172.16.3.72 – 172.16.3.73	172.16.3.73
38	172.16.3.74/31	172.16.3.74 – 172.16.3.75	172.16.3.75
39	172.16.3.76/31	172.16.3.76 – 172.16.3.77	172.16.3.77
40	172.16.3.78/31	172.16.3.78 – 172.16.3.79	172.16.3.79
41	172.16.3.80/31	172.16.3.80 – 172.16.3.81	172.16.3.81
42	172.16.3.82/31	172.16.3.82 – 172.16.3.83	172.16.3.83
43	172.16.3.84/31	172.16.3.84 – 172.16.3.85	172.16.3.85
44	172.16.3.86/31	172.16.3.86 – 172.16.3.87	172.16.3.87
45	172.16.3.88/31	172.16.3.88 – 172.16.3.89	172.16.3.89
46	172.16.3.90/31	172.16.3.90 – 172.16.3.91	172.16.3.91
47	172.16.3.92/31	172.16.3.92 – 172.16.3.93	172.16.3.93
48	172.16.3.94/31	172.16.3.94 – 172.16.3.95	172.16.3.95
49	172.16.3.96/31	172.16.3.96 – 172.16.3.97	172.16.3.97
50	172.16.3.98/31	172.16.3.98 – 172.16.3.99	172.16.3.99
51	172.16.3.100/31	172.16.3.100 – 172.16.3.101	172.16.3.101
52	172.16.3.102/31	172.16.3.102 – 172.16.3.103	172.16.3.103
53	172.16.3.104/31	172.16.3.104 – 172.16.3.105	172.16.3.105
54	172.16.3.106/31	172.16.3.106 – 172.16.3.107	172.16.3.107
55	172.16.3.108/31	172.16.3.108 – 172.16.3.109	172.16.3.109
56	172.16.3.110/31	172.16.3.110 – 172.16.3.111	172.16.3.111
57	172.16.3.112/31	172.16.3.112 – 172.16.3.113	172.16.3.113
58	172.16.3.114/31	172.16.3.114 – 172.16.3.115	172.16.3.115
59	172.16.3.116/31	172.16.3.116 – 172.16.3.117	172.16.3.117
60	172.16.3.118/31	172.16.3.118 – 172.16.3.119	172.16.3.119
61	172.16.3.120/31	172.16.3.120 – 172.16.3.121	172.16.3.121
62	172.16.3.122/31	172.16.3.122 – 172.16.3.123	172.16.3.123
63	172.16.3.124/31	172.16.3.124 – 172.16.3.125	172.16.3.125
64	172.16.3.126/31	172.16.3.126 – 172.16.3.127	172.16.3.127
65	172.16.3.128/31	172.16.3.128 – 172.16.3.129	172.16.3.129
66	172.16.3.130/31	172.16.3.130 – 172.16.3.131	172.16.3.131
67	172.16.3.132/31	172.16.3.132 – 172.16.3.133	172.16.3.133
68	172.16.3.134/31	172.16.3.134 – 172.16.3.135	172.16.3.135
69	172.16.3.136/31	172.16.3.136 – 172.16.3.137	172.16.3.137
70	172.16.3.138/31	172.16.3.138 – 172.16.3.139	172.16.3.139
71	172.16.3.140/31	172.16.3.140 – 172.16.3.141	172.16.3.141
72	172.16.3.142/31	172.16.3.142 – 172.16.3.143	172.16.3.143
73	172.16.3.144/31	172.16.3.144 – 172.16.3.145	172.16.3.145
74	172.16.3.146/31	172.16.3.146 – 172.16.3.147	172.16.3.147
75	172.16.3.148/31	172.16.3.148 – 172.16.3.149	172.16.3.149
76	172.16.3.150/31	172.16.3.150 – 172.16.3.151	172.16.3.151
77	172.16.3.152/31	172.16.3.152 – 172.16.3.153	172.16.3.153
78	172.16.3.154/31	172.16.3.154 – 172.16.3.155	172.16.3.155
79	172.16.3.156/31	172.16.3.156 – 172.16.3.157	172.16.3.157
80	172.16.3.158/31	172.16.3.158 – 172.16.3.159	172.16.3.159
81	172.16.3.160/31	172.16.3.160 – 172.16.3.161	172.16.3.161
82	172.16.3.162/31	172.16.3.162 – 172.16.3.163	172.16.3.163
83	172.16.3.164/31	172.16.3.164 – 172.16.3.165	172.16.3.165
84	172.16.3.166/31	172.16.3.166 – 172.16.3.167	172.16.3.167
85	172.16.3.168/31	172.16.3.168 – 172.16.3.169	172.16.3.169
86	172.16.3.170/31	172.16.3.170 – 172.16.3.171	172.16.3.171
87	172.16.3.172/31	172.16.3.172 – 172.16.3.173	172.16.3.173
88	172.16.3.174/31	172.16.3.174 – 172.16.3.175	172.16.3.175
89	172.16.3.176/31	172.16.3.176 – 172.16.3.177	172.16.3.177
90	172.16.3.178/31	172.16.3.178 – 172.16.3.179	172.16.3.179
91	172.16.3.180/31	172.16.3.180 – 172.16.3.181	172.16.3.181
92	172.16.3.182/31	172.16.3.182 – 172.16.3.183	172.16.3.183
93	172.16.3.184/31	172.16.3.184 – 172.16.3.185	172.16.3.185
94	172.16.3.186/31	172.16.3.186 – 172.16.3.187	172.16.3.187
95	172.16.3.188/31	172.16.3.188 – 172.16.3.189	172.16.3.189
96	172.16.3.190/31	172.16.3.190 – 172.16.3.191	172.16.3.191
97	172.16.3.192/31	172.16.3.192 – 172.16.3.193	172.16.3.193
98	172.16.3.194/31	172.16.3.194 – 172.16.3.195	172.16.3.195
99	172.16.3.196/31	172.16.3.196 – 172.16.3.197	172.16.3.197
100	172.16.3.198/31	172.16.3.198 – 172.16.3.199	172.16.3.199
101	172.16.3.200/31	172.16.3.200 – 172.16.3.201	172.16.3.201
102	172.16.3.202/31	172.16.3.202 – 172.16.3.203	172.16.3.203
103	172.16.3.204/31	172.16.3.204 – 172.16.3.205	172.16.3.205
104	172.16.3.206/31	172.16.3.206 – 172.16.3.207	172.16.3.207
105	172.16.3.208/31	172.16.3.208 – 172.16.3.209	172.16.3.209
106	172.16.3.210/31	172.16.3.210 – 172.16.3.211	172.16.3.211
107	172.16.3.212/31	172.16.3.212 – 172.16.3.213	172.16.3.213
108	172.16.3.214/31	172.16.3.214 – 172.16.3.215	172.16.3.215
109	172.16.3.216/31	172.16.3.216 – 172.16.3.217	172.16.3.217
110	172.16.3.218/31	172.16.3.218 – 172.16.3.219	172.16.3.219
111	172.16.3.220/31	172.16.3.220 – 172.16.3.221	172.16.3.221
112	172.16.3.222/31	172.16.3.222 – 172.16.3.223	172.16.3.223
113	172.16.3.224/31	172.16.3.224 – 172.16.3.225	172.16.3.225
114	172.16.3.226/31	172.16.3.226 – 172.16.3.227	172.16.3.227
115	172.16.3.228/31	172.16.3.228 – 172.16.3.229	172.16.3.229
116	172.16.3.230/31	172.16.3.230 – 172.16.3.231	172.16.3.231
117	172.16.3.232/31	172.16.3.232 – 172.16.3.233	172.16.3.233
118	172.16.3.234/31	172.16.3.234 – 172.16.3.235	172.16.3.235
119	172.16.3.236/31	172.16.3.236 – 172.16.3.237	172.16.3.237
120	172.16.3.238/31	172.16.3.238 – 172.16.3.239	172.16.3.239
121	172.16.3.240/31	172.16.3.240 – 172.16.3.241	172.16.3.241
122	172.16.3.242/31	172.16.3.242 – 172.16.3.243	172.16.3.243
123	172.16.3.244/31	172.16.3.244 – 172.16.3.245	172.16.3.245
124	172.16.3.246/31	172.16.3.246 – 172.16.3.247	172.16.3.247
125	172.16.3.248/31	172.16.3.248 – 172.16.3.249	172.16.3.249
126	172.16.3.250/31	172.16.3.250 – 172.16.3.251	172.16.3.251
127	172.16.3.252/31	172.16.3.252 – 172.16.3.253	172.16.3.253
128	172.16.3.254/31	172.16.3.254 – 172.16.3.255	172.16.3.255

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 →