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)10.0.191.0/24

network10.0.191.0/24

broadcast10.0.191.255

first host10.0.191.1

last host10.0.191.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.191.0/24

address00001010.00000000.10111111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.10111111.00000000

broadcast00001010.00000000.10111111.11111111

green = network part, grey = host part

hex0x0a00bf00

decimal167821056

reverse dns0.191.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:bf00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.191.0/31	10.0.191.0 – 10.0.191.1	10.0.191.1
2	10.0.191.2/31	10.0.191.2 – 10.0.191.3	10.0.191.3
3	10.0.191.4/31	10.0.191.4 – 10.0.191.5	10.0.191.5
4	10.0.191.6/31	10.0.191.6 – 10.0.191.7	10.0.191.7
5	10.0.191.8/31	10.0.191.8 – 10.0.191.9	10.0.191.9
6	10.0.191.10/31	10.0.191.10 – 10.0.191.11	10.0.191.11
7	10.0.191.12/31	10.0.191.12 – 10.0.191.13	10.0.191.13
8	10.0.191.14/31	10.0.191.14 – 10.0.191.15	10.0.191.15
9	10.0.191.16/31	10.0.191.16 – 10.0.191.17	10.0.191.17
10	10.0.191.18/31	10.0.191.18 – 10.0.191.19	10.0.191.19
11	10.0.191.20/31	10.0.191.20 – 10.0.191.21	10.0.191.21
12	10.0.191.22/31	10.0.191.22 – 10.0.191.23	10.0.191.23
13	10.0.191.24/31	10.0.191.24 – 10.0.191.25	10.0.191.25
14	10.0.191.26/31	10.0.191.26 – 10.0.191.27	10.0.191.27
15	10.0.191.28/31	10.0.191.28 – 10.0.191.29	10.0.191.29
16	10.0.191.30/31	10.0.191.30 – 10.0.191.31	10.0.191.31
17	10.0.191.32/31	10.0.191.32 – 10.0.191.33	10.0.191.33
18	10.0.191.34/31	10.0.191.34 – 10.0.191.35	10.0.191.35
19	10.0.191.36/31	10.0.191.36 – 10.0.191.37	10.0.191.37
20	10.0.191.38/31	10.0.191.38 – 10.0.191.39	10.0.191.39
21	10.0.191.40/31	10.0.191.40 – 10.0.191.41	10.0.191.41
22	10.0.191.42/31	10.0.191.42 – 10.0.191.43	10.0.191.43
23	10.0.191.44/31	10.0.191.44 – 10.0.191.45	10.0.191.45
24	10.0.191.46/31	10.0.191.46 – 10.0.191.47	10.0.191.47
25	10.0.191.48/31	10.0.191.48 – 10.0.191.49	10.0.191.49
26	10.0.191.50/31	10.0.191.50 – 10.0.191.51	10.0.191.51
27	10.0.191.52/31	10.0.191.52 – 10.0.191.53	10.0.191.53
28	10.0.191.54/31	10.0.191.54 – 10.0.191.55	10.0.191.55
29	10.0.191.56/31	10.0.191.56 – 10.0.191.57	10.0.191.57
30	10.0.191.58/31	10.0.191.58 – 10.0.191.59	10.0.191.59
31	10.0.191.60/31	10.0.191.60 – 10.0.191.61	10.0.191.61
32	10.0.191.62/31	10.0.191.62 – 10.0.191.63	10.0.191.63
33	10.0.191.64/31	10.0.191.64 – 10.0.191.65	10.0.191.65
34	10.0.191.66/31	10.0.191.66 – 10.0.191.67	10.0.191.67
35	10.0.191.68/31	10.0.191.68 – 10.0.191.69	10.0.191.69
36	10.0.191.70/31	10.0.191.70 – 10.0.191.71	10.0.191.71
37	10.0.191.72/31	10.0.191.72 – 10.0.191.73	10.0.191.73
38	10.0.191.74/31	10.0.191.74 – 10.0.191.75	10.0.191.75
39	10.0.191.76/31	10.0.191.76 – 10.0.191.77	10.0.191.77
40	10.0.191.78/31	10.0.191.78 – 10.0.191.79	10.0.191.79
41	10.0.191.80/31	10.0.191.80 – 10.0.191.81	10.0.191.81
42	10.0.191.82/31	10.0.191.82 – 10.0.191.83	10.0.191.83
43	10.0.191.84/31	10.0.191.84 – 10.0.191.85	10.0.191.85
44	10.0.191.86/31	10.0.191.86 – 10.0.191.87	10.0.191.87
45	10.0.191.88/31	10.0.191.88 – 10.0.191.89	10.0.191.89
46	10.0.191.90/31	10.0.191.90 – 10.0.191.91	10.0.191.91
47	10.0.191.92/31	10.0.191.92 – 10.0.191.93	10.0.191.93
48	10.0.191.94/31	10.0.191.94 – 10.0.191.95	10.0.191.95
49	10.0.191.96/31	10.0.191.96 – 10.0.191.97	10.0.191.97
50	10.0.191.98/31	10.0.191.98 – 10.0.191.99	10.0.191.99
51	10.0.191.100/31	10.0.191.100 – 10.0.191.101	10.0.191.101
52	10.0.191.102/31	10.0.191.102 – 10.0.191.103	10.0.191.103
53	10.0.191.104/31	10.0.191.104 – 10.0.191.105	10.0.191.105
54	10.0.191.106/31	10.0.191.106 – 10.0.191.107	10.0.191.107
55	10.0.191.108/31	10.0.191.108 – 10.0.191.109	10.0.191.109
56	10.0.191.110/31	10.0.191.110 – 10.0.191.111	10.0.191.111
57	10.0.191.112/31	10.0.191.112 – 10.0.191.113	10.0.191.113
58	10.0.191.114/31	10.0.191.114 – 10.0.191.115	10.0.191.115
59	10.0.191.116/31	10.0.191.116 – 10.0.191.117	10.0.191.117
60	10.0.191.118/31	10.0.191.118 – 10.0.191.119	10.0.191.119
61	10.0.191.120/31	10.0.191.120 – 10.0.191.121	10.0.191.121
62	10.0.191.122/31	10.0.191.122 – 10.0.191.123	10.0.191.123
63	10.0.191.124/31	10.0.191.124 – 10.0.191.125	10.0.191.125
64	10.0.191.126/31	10.0.191.126 – 10.0.191.127	10.0.191.127
65	10.0.191.128/31	10.0.191.128 – 10.0.191.129	10.0.191.129
66	10.0.191.130/31	10.0.191.130 – 10.0.191.131	10.0.191.131
67	10.0.191.132/31	10.0.191.132 – 10.0.191.133	10.0.191.133
68	10.0.191.134/31	10.0.191.134 – 10.0.191.135	10.0.191.135
69	10.0.191.136/31	10.0.191.136 – 10.0.191.137	10.0.191.137
70	10.0.191.138/31	10.0.191.138 – 10.0.191.139	10.0.191.139
71	10.0.191.140/31	10.0.191.140 – 10.0.191.141	10.0.191.141
72	10.0.191.142/31	10.0.191.142 – 10.0.191.143	10.0.191.143
73	10.0.191.144/31	10.0.191.144 – 10.0.191.145	10.0.191.145
74	10.0.191.146/31	10.0.191.146 – 10.0.191.147	10.0.191.147
75	10.0.191.148/31	10.0.191.148 – 10.0.191.149	10.0.191.149
76	10.0.191.150/31	10.0.191.150 – 10.0.191.151	10.0.191.151
77	10.0.191.152/31	10.0.191.152 – 10.0.191.153	10.0.191.153
78	10.0.191.154/31	10.0.191.154 – 10.0.191.155	10.0.191.155
79	10.0.191.156/31	10.0.191.156 – 10.0.191.157	10.0.191.157
80	10.0.191.158/31	10.0.191.158 – 10.0.191.159	10.0.191.159
81	10.0.191.160/31	10.0.191.160 – 10.0.191.161	10.0.191.161
82	10.0.191.162/31	10.0.191.162 – 10.0.191.163	10.0.191.163
83	10.0.191.164/31	10.0.191.164 – 10.0.191.165	10.0.191.165
84	10.0.191.166/31	10.0.191.166 – 10.0.191.167	10.0.191.167
85	10.0.191.168/31	10.0.191.168 – 10.0.191.169	10.0.191.169
86	10.0.191.170/31	10.0.191.170 – 10.0.191.171	10.0.191.171
87	10.0.191.172/31	10.0.191.172 – 10.0.191.173	10.0.191.173
88	10.0.191.174/31	10.0.191.174 – 10.0.191.175	10.0.191.175
89	10.0.191.176/31	10.0.191.176 – 10.0.191.177	10.0.191.177
90	10.0.191.178/31	10.0.191.178 – 10.0.191.179	10.0.191.179
91	10.0.191.180/31	10.0.191.180 – 10.0.191.181	10.0.191.181
92	10.0.191.182/31	10.0.191.182 – 10.0.191.183	10.0.191.183
93	10.0.191.184/31	10.0.191.184 – 10.0.191.185	10.0.191.185
94	10.0.191.186/31	10.0.191.186 – 10.0.191.187	10.0.191.187
95	10.0.191.188/31	10.0.191.188 – 10.0.191.189	10.0.191.189
96	10.0.191.190/31	10.0.191.190 – 10.0.191.191	10.0.191.191
97	10.0.191.192/31	10.0.191.192 – 10.0.191.193	10.0.191.193
98	10.0.191.194/31	10.0.191.194 – 10.0.191.195	10.0.191.195
99	10.0.191.196/31	10.0.191.196 – 10.0.191.197	10.0.191.197
100	10.0.191.198/31	10.0.191.198 – 10.0.191.199	10.0.191.199
101	10.0.191.200/31	10.0.191.200 – 10.0.191.201	10.0.191.201
102	10.0.191.202/31	10.0.191.202 – 10.0.191.203	10.0.191.203
103	10.0.191.204/31	10.0.191.204 – 10.0.191.205	10.0.191.205
104	10.0.191.206/31	10.0.191.206 – 10.0.191.207	10.0.191.207
105	10.0.191.208/31	10.0.191.208 – 10.0.191.209	10.0.191.209
106	10.0.191.210/31	10.0.191.210 – 10.0.191.211	10.0.191.211
107	10.0.191.212/31	10.0.191.212 – 10.0.191.213	10.0.191.213
108	10.0.191.214/31	10.0.191.214 – 10.0.191.215	10.0.191.215
109	10.0.191.216/31	10.0.191.216 – 10.0.191.217	10.0.191.217
110	10.0.191.218/31	10.0.191.218 – 10.0.191.219	10.0.191.219
111	10.0.191.220/31	10.0.191.220 – 10.0.191.221	10.0.191.221
112	10.0.191.222/31	10.0.191.222 – 10.0.191.223	10.0.191.223
113	10.0.191.224/31	10.0.191.224 – 10.0.191.225	10.0.191.225
114	10.0.191.226/31	10.0.191.226 – 10.0.191.227	10.0.191.227
115	10.0.191.228/31	10.0.191.228 – 10.0.191.229	10.0.191.229
116	10.0.191.230/31	10.0.191.230 – 10.0.191.231	10.0.191.231
117	10.0.191.232/31	10.0.191.232 – 10.0.191.233	10.0.191.233
118	10.0.191.234/31	10.0.191.234 – 10.0.191.235	10.0.191.235
119	10.0.191.236/31	10.0.191.236 – 10.0.191.237	10.0.191.237
120	10.0.191.238/31	10.0.191.238 – 10.0.191.239	10.0.191.239
121	10.0.191.240/31	10.0.191.240 – 10.0.191.241	10.0.191.241
122	10.0.191.242/31	10.0.191.242 – 10.0.191.243	10.0.191.243
123	10.0.191.244/31	10.0.191.244 – 10.0.191.245	10.0.191.245
124	10.0.191.246/31	10.0.191.246 – 10.0.191.247	10.0.191.247
125	10.0.191.248/31	10.0.191.248 – 10.0.191.249	10.0.191.249
126	10.0.191.250/31	10.0.191.250 – 10.0.191.251	10.0.191.251
127	10.0.191.252/31	10.0.191.252 – 10.0.191.253	10.0.191.253
128	10.0.191.254/31	10.0.191.254 – 10.0.191.255	10.0.191.255

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 →