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)10.2.157.0/24

network10.2.157.0/24

broadcast10.2.157.255

first host10.2.157.1

last host10.2.157.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.157.0/24

address00001010.00000010.10011101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10011101.00000000

broadcast00001010.00000010.10011101.11111111

green = network part, grey = host part

hex0x0a029d00

decimal167943424

reverse dns0.157.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:9d00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.157.0/31	10.2.157.0 – 10.2.157.1	10.2.157.1
2	10.2.157.2/31	10.2.157.2 – 10.2.157.3	10.2.157.3
3	10.2.157.4/31	10.2.157.4 – 10.2.157.5	10.2.157.5
4	10.2.157.6/31	10.2.157.6 – 10.2.157.7	10.2.157.7
5	10.2.157.8/31	10.2.157.8 – 10.2.157.9	10.2.157.9
6	10.2.157.10/31	10.2.157.10 – 10.2.157.11	10.2.157.11
7	10.2.157.12/31	10.2.157.12 – 10.2.157.13	10.2.157.13
8	10.2.157.14/31	10.2.157.14 – 10.2.157.15	10.2.157.15
9	10.2.157.16/31	10.2.157.16 – 10.2.157.17	10.2.157.17
10	10.2.157.18/31	10.2.157.18 – 10.2.157.19	10.2.157.19
11	10.2.157.20/31	10.2.157.20 – 10.2.157.21	10.2.157.21
12	10.2.157.22/31	10.2.157.22 – 10.2.157.23	10.2.157.23
13	10.2.157.24/31	10.2.157.24 – 10.2.157.25	10.2.157.25
14	10.2.157.26/31	10.2.157.26 – 10.2.157.27	10.2.157.27
15	10.2.157.28/31	10.2.157.28 – 10.2.157.29	10.2.157.29
16	10.2.157.30/31	10.2.157.30 – 10.2.157.31	10.2.157.31
17	10.2.157.32/31	10.2.157.32 – 10.2.157.33	10.2.157.33
18	10.2.157.34/31	10.2.157.34 – 10.2.157.35	10.2.157.35
19	10.2.157.36/31	10.2.157.36 – 10.2.157.37	10.2.157.37
20	10.2.157.38/31	10.2.157.38 – 10.2.157.39	10.2.157.39
21	10.2.157.40/31	10.2.157.40 – 10.2.157.41	10.2.157.41
22	10.2.157.42/31	10.2.157.42 – 10.2.157.43	10.2.157.43
23	10.2.157.44/31	10.2.157.44 – 10.2.157.45	10.2.157.45
24	10.2.157.46/31	10.2.157.46 – 10.2.157.47	10.2.157.47
25	10.2.157.48/31	10.2.157.48 – 10.2.157.49	10.2.157.49
26	10.2.157.50/31	10.2.157.50 – 10.2.157.51	10.2.157.51
27	10.2.157.52/31	10.2.157.52 – 10.2.157.53	10.2.157.53
28	10.2.157.54/31	10.2.157.54 – 10.2.157.55	10.2.157.55
29	10.2.157.56/31	10.2.157.56 – 10.2.157.57	10.2.157.57
30	10.2.157.58/31	10.2.157.58 – 10.2.157.59	10.2.157.59
31	10.2.157.60/31	10.2.157.60 – 10.2.157.61	10.2.157.61
32	10.2.157.62/31	10.2.157.62 – 10.2.157.63	10.2.157.63
33	10.2.157.64/31	10.2.157.64 – 10.2.157.65	10.2.157.65
34	10.2.157.66/31	10.2.157.66 – 10.2.157.67	10.2.157.67
35	10.2.157.68/31	10.2.157.68 – 10.2.157.69	10.2.157.69
36	10.2.157.70/31	10.2.157.70 – 10.2.157.71	10.2.157.71
37	10.2.157.72/31	10.2.157.72 – 10.2.157.73	10.2.157.73
38	10.2.157.74/31	10.2.157.74 – 10.2.157.75	10.2.157.75
39	10.2.157.76/31	10.2.157.76 – 10.2.157.77	10.2.157.77
40	10.2.157.78/31	10.2.157.78 – 10.2.157.79	10.2.157.79
41	10.2.157.80/31	10.2.157.80 – 10.2.157.81	10.2.157.81
42	10.2.157.82/31	10.2.157.82 – 10.2.157.83	10.2.157.83
43	10.2.157.84/31	10.2.157.84 – 10.2.157.85	10.2.157.85
44	10.2.157.86/31	10.2.157.86 – 10.2.157.87	10.2.157.87
45	10.2.157.88/31	10.2.157.88 – 10.2.157.89	10.2.157.89
46	10.2.157.90/31	10.2.157.90 – 10.2.157.91	10.2.157.91
47	10.2.157.92/31	10.2.157.92 – 10.2.157.93	10.2.157.93
48	10.2.157.94/31	10.2.157.94 – 10.2.157.95	10.2.157.95
49	10.2.157.96/31	10.2.157.96 – 10.2.157.97	10.2.157.97
50	10.2.157.98/31	10.2.157.98 – 10.2.157.99	10.2.157.99
51	10.2.157.100/31	10.2.157.100 – 10.2.157.101	10.2.157.101
52	10.2.157.102/31	10.2.157.102 – 10.2.157.103	10.2.157.103
53	10.2.157.104/31	10.2.157.104 – 10.2.157.105	10.2.157.105
54	10.2.157.106/31	10.2.157.106 – 10.2.157.107	10.2.157.107
55	10.2.157.108/31	10.2.157.108 – 10.2.157.109	10.2.157.109
56	10.2.157.110/31	10.2.157.110 – 10.2.157.111	10.2.157.111
57	10.2.157.112/31	10.2.157.112 – 10.2.157.113	10.2.157.113
58	10.2.157.114/31	10.2.157.114 – 10.2.157.115	10.2.157.115
59	10.2.157.116/31	10.2.157.116 – 10.2.157.117	10.2.157.117
60	10.2.157.118/31	10.2.157.118 – 10.2.157.119	10.2.157.119
61	10.2.157.120/31	10.2.157.120 – 10.2.157.121	10.2.157.121
62	10.2.157.122/31	10.2.157.122 – 10.2.157.123	10.2.157.123
63	10.2.157.124/31	10.2.157.124 – 10.2.157.125	10.2.157.125
64	10.2.157.126/31	10.2.157.126 – 10.2.157.127	10.2.157.127
65	10.2.157.128/31	10.2.157.128 – 10.2.157.129	10.2.157.129
66	10.2.157.130/31	10.2.157.130 – 10.2.157.131	10.2.157.131
67	10.2.157.132/31	10.2.157.132 – 10.2.157.133	10.2.157.133
68	10.2.157.134/31	10.2.157.134 – 10.2.157.135	10.2.157.135
69	10.2.157.136/31	10.2.157.136 – 10.2.157.137	10.2.157.137
70	10.2.157.138/31	10.2.157.138 – 10.2.157.139	10.2.157.139
71	10.2.157.140/31	10.2.157.140 – 10.2.157.141	10.2.157.141
72	10.2.157.142/31	10.2.157.142 – 10.2.157.143	10.2.157.143
73	10.2.157.144/31	10.2.157.144 – 10.2.157.145	10.2.157.145
74	10.2.157.146/31	10.2.157.146 – 10.2.157.147	10.2.157.147
75	10.2.157.148/31	10.2.157.148 – 10.2.157.149	10.2.157.149
76	10.2.157.150/31	10.2.157.150 – 10.2.157.151	10.2.157.151
77	10.2.157.152/31	10.2.157.152 – 10.2.157.153	10.2.157.153
78	10.2.157.154/31	10.2.157.154 – 10.2.157.155	10.2.157.155
79	10.2.157.156/31	10.2.157.156 – 10.2.157.157	10.2.157.157
80	10.2.157.158/31	10.2.157.158 – 10.2.157.159	10.2.157.159
81	10.2.157.160/31	10.2.157.160 – 10.2.157.161	10.2.157.161
82	10.2.157.162/31	10.2.157.162 – 10.2.157.163	10.2.157.163
83	10.2.157.164/31	10.2.157.164 – 10.2.157.165	10.2.157.165
84	10.2.157.166/31	10.2.157.166 – 10.2.157.167	10.2.157.167
85	10.2.157.168/31	10.2.157.168 – 10.2.157.169	10.2.157.169
86	10.2.157.170/31	10.2.157.170 – 10.2.157.171	10.2.157.171
87	10.2.157.172/31	10.2.157.172 – 10.2.157.173	10.2.157.173
88	10.2.157.174/31	10.2.157.174 – 10.2.157.175	10.2.157.175
89	10.2.157.176/31	10.2.157.176 – 10.2.157.177	10.2.157.177
90	10.2.157.178/31	10.2.157.178 – 10.2.157.179	10.2.157.179
91	10.2.157.180/31	10.2.157.180 – 10.2.157.181	10.2.157.181
92	10.2.157.182/31	10.2.157.182 – 10.2.157.183	10.2.157.183
93	10.2.157.184/31	10.2.157.184 – 10.2.157.185	10.2.157.185
94	10.2.157.186/31	10.2.157.186 – 10.2.157.187	10.2.157.187
95	10.2.157.188/31	10.2.157.188 – 10.2.157.189	10.2.157.189
96	10.2.157.190/31	10.2.157.190 – 10.2.157.191	10.2.157.191
97	10.2.157.192/31	10.2.157.192 – 10.2.157.193	10.2.157.193
98	10.2.157.194/31	10.2.157.194 – 10.2.157.195	10.2.157.195
99	10.2.157.196/31	10.2.157.196 – 10.2.157.197	10.2.157.197
100	10.2.157.198/31	10.2.157.198 – 10.2.157.199	10.2.157.199
101	10.2.157.200/31	10.2.157.200 – 10.2.157.201	10.2.157.201
102	10.2.157.202/31	10.2.157.202 – 10.2.157.203	10.2.157.203
103	10.2.157.204/31	10.2.157.204 – 10.2.157.205	10.2.157.205
104	10.2.157.206/31	10.2.157.206 – 10.2.157.207	10.2.157.207
105	10.2.157.208/31	10.2.157.208 – 10.2.157.209	10.2.157.209
106	10.2.157.210/31	10.2.157.210 – 10.2.157.211	10.2.157.211
107	10.2.157.212/31	10.2.157.212 – 10.2.157.213	10.2.157.213
108	10.2.157.214/31	10.2.157.214 – 10.2.157.215	10.2.157.215
109	10.2.157.216/31	10.2.157.216 – 10.2.157.217	10.2.157.217
110	10.2.157.218/31	10.2.157.218 – 10.2.157.219	10.2.157.219
111	10.2.157.220/31	10.2.157.220 – 10.2.157.221	10.2.157.221
112	10.2.157.222/31	10.2.157.222 – 10.2.157.223	10.2.157.223
113	10.2.157.224/31	10.2.157.224 – 10.2.157.225	10.2.157.225
114	10.2.157.226/31	10.2.157.226 – 10.2.157.227	10.2.157.227
115	10.2.157.228/31	10.2.157.228 – 10.2.157.229	10.2.157.229
116	10.2.157.230/31	10.2.157.230 – 10.2.157.231	10.2.157.231
117	10.2.157.232/31	10.2.157.232 – 10.2.157.233	10.2.157.233
118	10.2.157.234/31	10.2.157.234 – 10.2.157.235	10.2.157.235
119	10.2.157.236/31	10.2.157.236 – 10.2.157.237	10.2.157.237
120	10.2.157.238/31	10.2.157.238 – 10.2.157.239	10.2.157.239
121	10.2.157.240/31	10.2.157.240 – 10.2.157.241	10.2.157.241
122	10.2.157.242/31	10.2.157.242 – 10.2.157.243	10.2.157.243
123	10.2.157.244/31	10.2.157.244 – 10.2.157.245	10.2.157.245
124	10.2.157.246/31	10.2.157.246 – 10.2.157.247	10.2.157.247
125	10.2.157.248/31	10.2.157.248 – 10.2.157.249	10.2.157.249
126	10.2.157.250/31	10.2.157.250 – 10.2.157.251	10.2.157.251
127	10.2.157.252/31	10.2.157.252 – 10.2.157.253	10.2.157.253
128	10.2.157.254/31	10.2.157.254 – 10.2.157.255	10.2.157.255

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 →