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)10.91.151.0/24

network10.91.151.0/24

broadcast10.91.151.255

first host10.91.151.1

last host10.91.151.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.91.151.0/24

address00001010.01011011.10010111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01011011.10010111.00000000

broadcast00001010.01011011.10010111.11111111

green = network part, grey = host part

hex0x0a5b9700

decimal173774592

reverse dns0.151.91.10.in-addr.arpa

ipv4-mapped::ffff:a5b:9700

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.91.151.0/31	10.91.151.0 – 10.91.151.1	10.91.151.1
2	10.91.151.2/31	10.91.151.2 – 10.91.151.3	10.91.151.3
3	10.91.151.4/31	10.91.151.4 – 10.91.151.5	10.91.151.5
4	10.91.151.6/31	10.91.151.6 – 10.91.151.7	10.91.151.7
5	10.91.151.8/31	10.91.151.8 – 10.91.151.9	10.91.151.9
6	10.91.151.10/31	10.91.151.10 – 10.91.151.11	10.91.151.11
7	10.91.151.12/31	10.91.151.12 – 10.91.151.13	10.91.151.13
8	10.91.151.14/31	10.91.151.14 – 10.91.151.15	10.91.151.15
9	10.91.151.16/31	10.91.151.16 – 10.91.151.17	10.91.151.17
10	10.91.151.18/31	10.91.151.18 – 10.91.151.19	10.91.151.19
11	10.91.151.20/31	10.91.151.20 – 10.91.151.21	10.91.151.21
12	10.91.151.22/31	10.91.151.22 – 10.91.151.23	10.91.151.23
13	10.91.151.24/31	10.91.151.24 – 10.91.151.25	10.91.151.25
14	10.91.151.26/31	10.91.151.26 – 10.91.151.27	10.91.151.27
15	10.91.151.28/31	10.91.151.28 – 10.91.151.29	10.91.151.29
16	10.91.151.30/31	10.91.151.30 – 10.91.151.31	10.91.151.31
17	10.91.151.32/31	10.91.151.32 – 10.91.151.33	10.91.151.33
18	10.91.151.34/31	10.91.151.34 – 10.91.151.35	10.91.151.35
19	10.91.151.36/31	10.91.151.36 – 10.91.151.37	10.91.151.37
20	10.91.151.38/31	10.91.151.38 – 10.91.151.39	10.91.151.39
21	10.91.151.40/31	10.91.151.40 – 10.91.151.41	10.91.151.41
22	10.91.151.42/31	10.91.151.42 – 10.91.151.43	10.91.151.43
23	10.91.151.44/31	10.91.151.44 – 10.91.151.45	10.91.151.45
24	10.91.151.46/31	10.91.151.46 – 10.91.151.47	10.91.151.47
25	10.91.151.48/31	10.91.151.48 – 10.91.151.49	10.91.151.49
26	10.91.151.50/31	10.91.151.50 – 10.91.151.51	10.91.151.51
27	10.91.151.52/31	10.91.151.52 – 10.91.151.53	10.91.151.53
28	10.91.151.54/31	10.91.151.54 – 10.91.151.55	10.91.151.55
29	10.91.151.56/31	10.91.151.56 – 10.91.151.57	10.91.151.57
30	10.91.151.58/31	10.91.151.58 – 10.91.151.59	10.91.151.59
31	10.91.151.60/31	10.91.151.60 – 10.91.151.61	10.91.151.61
32	10.91.151.62/31	10.91.151.62 – 10.91.151.63	10.91.151.63
33	10.91.151.64/31	10.91.151.64 – 10.91.151.65	10.91.151.65
34	10.91.151.66/31	10.91.151.66 – 10.91.151.67	10.91.151.67
35	10.91.151.68/31	10.91.151.68 – 10.91.151.69	10.91.151.69
36	10.91.151.70/31	10.91.151.70 – 10.91.151.71	10.91.151.71
37	10.91.151.72/31	10.91.151.72 – 10.91.151.73	10.91.151.73
38	10.91.151.74/31	10.91.151.74 – 10.91.151.75	10.91.151.75
39	10.91.151.76/31	10.91.151.76 – 10.91.151.77	10.91.151.77
40	10.91.151.78/31	10.91.151.78 – 10.91.151.79	10.91.151.79
41	10.91.151.80/31	10.91.151.80 – 10.91.151.81	10.91.151.81
42	10.91.151.82/31	10.91.151.82 – 10.91.151.83	10.91.151.83
43	10.91.151.84/31	10.91.151.84 – 10.91.151.85	10.91.151.85
44	10.91.151.86/31	10.91.151.86 – 10.91.151.87	10.91.151.87
45	10.91.151.88/31	10.91.151.88 – 10.91.151.89	10.91.151.89
46	10.91.151.90/31	10.91.151.90 – 10.91.151.91	10.91.151.91
47	10.91.151.92/31	10.91.151.92 – 10.91.151.93	10.91.151.93
48	10.91.151.94/31	10.91.151.94 – 10.91.151.95	10.91.151.95
49	10.91.151.96/31	10.91.151.96 – 10.91.151.97	10.91.151.97
50	10.91.151.98/31	10.91.151.98 – 10.91.151.99	10.91.151.99
51	10.91.151.100/31	10.91.151.100 – 10.91.151.101	10.91.151.101
52	10.91.151.102/31	10.91.151.102 – 10.91.151.103	10.91.151.103
53	10.91.151.104/31	10.91.151.104 – 10.91.151.105	10.91.151.105
54	10.91.151.106/31	10.91.151.106 – 10.91.151.107	10.91.151.107
55	10.91.151.108/31	10.91.151.108 – 10.91.151.109	10.91.151.109
56	10.91.151.110/31	10.91.151.110 – 10.91.151.111	10.91.151.111
57	10.91.151.112/31	10.91.151.112 – 10.91.151.113	10.91.151.113
58	10.91.151.114/31	10.91.151.114 – 10.91.151.115	10.91.151.115
59	10.91.151.116/31	10.91.151.116 – 10.91.151.117	10.91.151.117
60	10.91.151.118/31	10.91.151.118 – 10.91.151.119	10.91.151.119
61	10.91.151.120/31	10.91.151.120 – 10.91.151.121	10.91.151.121
62	10.91.151.122/31	10.91.151.122 – 10.91.151.123	10.91.151.123
63	10.91.151.124/31	10.91.151.124 – 10.91.151.125	10.91.151.125
64	10.91.151.126/31	10.91.151.126 – 10.91.151.127	10.91.151.127
65	10.91.151.128/31	10.91.151.128 – 10.91.151.129	10.91.151.129
66	10.91.151.130/31	10.91.151.130 – 10.91.151.131	10.91.151.131
67	10.91.151.132/31	10.91.151.132 – 10.91.151.133	10.91.151.133
68	10.91.151.134/31	10.91.151.134 – 10.91.151.135	10.91.151.135
69	10.91.151.136/31	10.91.151.136 – 10.91.151.137	10.91.151.137
70	10.91.151.138/31	10.91.151.138 – 10.91.151.139	10.91.151.139
71	10.91.151.140/31	10.91.151.140 – 10.91.151.141	10.91.151.141
72	10.91.151.142/31	10.91.151.142 – 10.91.151.143	10.91.151.143
73	10.91.151.144/31	10.91.151.144 – 10.91.151.145	10.91.151.145
74	10.91.151.146/31	10.91.151.146 – 10.91.151.147	10.91.151.147
75	10.91.151.148/31	10.91.151.148 – 10.91.151.149	10.91.151.149
76	10.91.151.150/31	10.91.151.150 – 10.91.151.151	10.91.151.151
77	10.91.151.152/31	10.91.151.152 – 10.91.151.153	10.91.151.153
78	10.91.151.154/31	10.91.151.154 – 10.91.151.155	10.91.151.155
79	10.91.151.156/31	10.91.151.156 – 10.91.151.157	10.91.151.157
80	10.91.151.158/31	10.91.151.158 – 10.91.151.159	10.91.151.159
81	10.91.151.160/31	10.91.151.160 – 10.91.151.161	10.91.151.161
82	10.91.151.162/31	10.91.151.162 – 10.91.151.163	10.91.151.163
83	10.91.151.164/31	10.91.151.164 – 10.91.151.165	10.91.151.165
84	10.91.151.166/31	10.91.151.166 – 10.91.151.167	10.91.151.167
85	10.91.151.168/31	10.91.151.168 – 10.91.151.169	10.91.151.169
86	10.91.151.170/31	10.91.151.170 – 10.91.151.171	10.91.151.171
87	10.91.151.172/31	10.91.151.172 – 10.91.151.173	10.91.151.173
88	10.91.151.174/31	10.91.151.174 – 10.91.151.175	10.91.151.175
89	10.91.151.176/31	10.91.151.176 – 10.91.151.177	10.91.151.177
90	10.91.151.178/31	10.91.151.178 – 10.91.151.179	10.91.151.179
91	10.91.151.180/31	10.91.151.180 – 10.91.151.181	10.91.151.181
92	10.91.151.182/31	10.91.151.182 – 10.91.151.183	10.91.151.183
93	10.91.151.184/31	10.91.151.184 – 10.91.151.185	10.91.151.185
94	10.91.151.186/31	10.91.151.186 – 10.91.151.187	10.91.151.187
95	10.91.151.188/31	10.91.151.188 – 10.91.151.189	10.91.151.189
96	10.91.151.190/31	10.91.151.190 – 10.91.151.191	10.91.151.191
97	10.91.151.192/31	10.91.151.192 – 10.91.151.193	10.91.151.193
98	10.91.151.194/31	10.91.151.194 – 10.91.151.195	10.91.151.195
99	10.91.151.196/31	10.91.151.196 – 10.91.151.197	10.91.151.197
100	10.91.151.198/31	10.91.151.198 – 10.91.151.199	10.91.151.199
101	10.91.151.200/31	10.91.151.200 – 10.91.151.201	10.91.151.201
102	10.91.151.202/31	10.91.151.202 – 10.91.151.203	10.91.151.203
103	10.91.151.204/31	10.91.151.204 – 10.91.151.205	10.91.151.205
104	10.91.151.206/31	10.91.151.206 – 10.91.151.207	10.91.151.207
105	10.91.151.208/31	10.91.151.208 – 10.91.151.209	10.91.151.209
106	10.91.151.210/31	10.91.151.210 – 10.91.151.211	10.91.151.211
107	10.91.151.212/31	10.91.151.212 – 10.91.151.213	10.91.151.213
108	10.91.151.214/31	10.91.151.214 – 10.91.151.215	10.91.151.215
109	10.91.151.216/31	10.91.151.216 – 10.91.151.217	10.91.151.217
110	10.91.151.218/31	10.91.151.218 – 10.91.151.219	10.91.151.219
111	10.91.151.220/31	10.91.151.220 – 10.91.151.221	10.91.151.221
112	10.91.151.222/31	10.91.151.222 – 10.91.151.223	10.91.151.223
113	10.91.151.224/31	10.91.151.224 – 10.91.151.225	10.91.151.225
114	10.91.151.226/31	10.91.151.226 – 10.91.151.227	10.91.151.227
115	10.91.151.228/31	10.91.151.228 – 10.91.151.229	10.91.151.229
116	10.91.151.230/31	10.91.151.230 – 10.91.151.231	10.91.151.231
117	10.91.151.232/31	10.91.151.232 – 10.91.151.233	10.91.151.233
118	10.91.151.234/31	10.91.151.234 – 10.91.151.235	10.91.151.235
119	10.91.151.236/31	10.91.151.236 – 10.91.151.237	10.91.151.237
120	10.91.151.238/31	10.91.151.238 – 10.91.151.239	10.91.151.239
121	10.91.151.240/31	10.91.151.240 – 10.91.151.241	10.91.151.241
122	10.91.151.242/31	10.91.151.242 – 10.91.151.243	10.91.151.243
123	10.91.151.244/31	10.91.151.244 – 10.91.151.245	10.91.151.245
124	10.91.151.246/31	10.91.151.246 – 10.91.151.247	10.91.151.247
125	10.91.151.248/31	10.91.151.248 – 10.91.151.249	10.91.151.249
126	10.91.151.250/31	10.91.151.250 – 10.91.151.251	10.91.151.251
127	10.91.151.252/31	10.91.151.252 – 10.91.151.253	10.91.151.253
128	10.91.151.254/31	10.91.151.254 – 10.91.151.255	10.91.151.255

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 →