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)10.87.71.0/24

network10.87.71.0/24

broadcast10.87.71.255

first host10.87.71.1

last host10.87.71.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.87.71.0/24

address00001010.01010111.01000111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01010111.01000111.00000000

broadcast00001010.01010111.01000111.11111111

green = network part, grey = host part

hex0x0a574700

decimal173491968

reverse dns0.71.87.10.in-addr.arpa

ipv4-mapped::ffff:a57:4700

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.87.71.0/31	10.87.71.0 – 10.87.71.1	10.87.71.1
2	10.87.71.2/31	10.87.71.2 – 10.87.71.3	10.87.71.3
3	10.87.71.4/31	10.87.71.4 – 10.87.71.5	10.87.71.5
4	10.87.71.6/31	10.87.71.6 – 10.87.71.7	10.87.71.7
5	10.87.71.8/31	10.87.71.8 – 10.87.71.9	10.87.71.9
6	10.87.71.10/31	10.87.71.10 – 10.87.71.11	10.87.71.11
7	10.87.71.12/31	10.87.71.12 – 10.87.71.13	10.87.71.13
8	10.87.71.14/31	10.87.71.14 – 10.87.71.15	10.87.71.15
9	10.87.71.16/31	10.87.71.16 – 10.87.71.17	10.87.71.17
10	10.87.71.18/31	10.87.71.18 – 10.87.71.19	10.87.71.19
11	10.87.71.20/31	10.87.71.20 – 10.87.71.21	10.87.71.21
12	10.87.71.22/31	10.87.71.22 – 10.87.71.23	10.87.71.23
13	10.87.71.24/31	10.87.71.24 – 10.87.71.25	10.87.71.25
14	10.87.71.26/31	10.87.71.26 – 10.87.71.27	10.87.71.27
15	10.87.71.28/31	10.87.71.28 – 10.87.71.29	10.87.71.29
16	10.87.71.30/31	10.87.71.30 – 10.87.71.31	10.87.71.31
17	10.87.71.32/31	10.87.71.32 – 10.87.71.33	10.87.71.33
18	10.87.71.34/31	10.87.71.34 – 10.87.71.35	10.87.71.35
19	10.87.71.36/31	10.87.71.36 – 10.87.71.37	10.87.71.37
20	10.87.71.38/31	10.87.71.38 – 10.87.71.39	10.87.71.39
21	10.87.71.40/31	10.87.71.40 – 10.87.71.41	10.87.71.41
22	10.87.71.42/31	10.87.71.42 – 10.87.71.43	10.87.71.43
23	10.87.71.44/31	10.87.71.44 – 10.87.71.45	10.87.71.45
24	10.87.71.46/31	10.87.71.46 – 10.87.71.47	10.87.71.47
25	10.87.71.48/31	10.87.71.48 – 10.87.71.49	10.87.71.49
26	10.87.71.50/31	10.87.71.50 – 10.87.71.51	10.87.71.51
27	10.87.71.52/31	10.87.71.52 – 10.87.71.53	10.87.71.53
28	10.87.71.54/31	10.87.71.54 – 10.87.71.55	10.87.71.55
29	10.87.71.56/31	10.87.71.56 – 10.87.71.57	10.87.71.57
30	10.87.71.58/31	10.87.71.58 – 10.87.71.59	10.87.71.59
31	10.87.71.60/31	10.87.71.60 – 10.87.71.61	10.87.71.61
32	10.87.71.62/31	10.87.71.62 – 10.87.71.63	10.87.71.63
33	10.87.71.64/31	10.87.71.64 – 10.87.71.65	10.87.71.65
34	10.87.71.66/31	10.87.71.66 – 10.87.71.67	10.87.71.67
35	10.87.71.68/31	10.87.71.68 – 10.87.71.69	10.87.71.69
36	10.87.71.70/31	10.87.71.70 – 10.87.71.71	10.87.71.71
37	10.87.71.72/31	10.87.71.72 – 10.87.71.73	10.87.71.73
38	10.87.71.74/31	10.87.71.74 – 10.87.71.75	10.87.71.75
39	10.87.71.76/31	10.87.71.76 – 10.87.71.77	10.87.71.77
40	10.87.71.78/31	10.87.71.78 – 10.87.71.79	10.87.71.79
41	10.87.71.80/31	10.87.71.80 – 10.87.71.81	10.87.71.81
42	10.87.71.82/31	10.87.71.82 – 10.87.71.83	10.87.71.83
43	10.87.71.84/31	10.87.71.84 – 10.87.71.85	10.87.71.85
44	10.87.71.86/31	10.87.71.86 – 10.87.71.87	10.87.71.87
45	10.87.71.88/31	10.87.71.88 – 10.87.71.89	10.87.71.89
46	10.87.71.90/31	10.87.71.90 – 10.87.71.91	10.87.71.91
47	10.87.71.92/31	10.87.71.92 – 10.87.71.93	10.87.71.93
48	10.87.71.94/31	10.87.71.94 – 10.87.71.95	10.87.71.95
49	10.87.71.96/31	10.87.71.96 – 10.87.71.97	10.87.71.97
50	10.87.71.98/31	10.87.71.98 – 10.87.71.99	10.87.71.99
51	10.87.71.100/31	10.87.71.100 – 10.87.71.101	10.87.71.101
52	10.87.71.102/31	10.87.71.102 – 10.87.71.103	10.87.71.103
53	10.87.71.104/31	10.87.71.104 – 10.87.71.105	10.87.71.105
54	10.87.71.106/31	10.87.71.106 – 10.87.71.107	10.87.71.107
55	10.87.71.108/31	10.87.71.108 – 10.87.71.109	10.87.71.109
56	10.87.71.110/31	10.87.71.110 – 10.87.71.111	10.87.71.111
57	10.87.71.112/31	10.87.71.112 – 10.87.71.113	10.87.71.113
58	10.87.71.114/31	10.87.71.114 – 10.87.71.115	10.87.71.115
59	10.87.71.116/31	10.87.71.116 – 10.87.71.117	10.87.71.117
60	10.87.71.118/31	10.87.71.118 – 10.87.71.119	10.87.71.119
61	10.87.71.120/31	10.87.71.120 – 10.87.71.121	10.87.71.121
62	10.87.71.122/31	10.87.71.122 – 10.87.71.123	10.87.71.123
63	10.87.71.124/31	10.87.71.124 – 10.87.71.125	10.87.71.125
64	10.87.71.126/31	10.87.71.126 – 10.87.71.127	10.87.71.127
65	10.87.71.128/31	10.87.71.128 – 10.87.71.129	10.87.71.129
66	10.87.71.130/31	10.87.71.130 – 10.87.71.131	10.87.71.131
67	10.87.71.132/31	10.87.71.132 – 10.87.71.133	10.87.71.133
68	10.87.71.134/31	10.87.71.134 – 10.87.71.135	10.87.71.135
69	10.87.71.136/31	10.87.71.136 – 10.87.71.137	10.87.71.137
70	10.87.71.138/31	10.87.71.138 – 10.87.71.139	10.87.71.139
71	10.87.71.140/31	10.87.71.140 – 10.87.71.141	10.87.71.141
72	10.87.71.142/31	10.87.71.142 – 10.87.71.143	10.87.71.143
73	10.87.71.144/31	10.87.71.144 – 10.87.71.145	10.87.71.145
74	10.87.71.146/31	10.87.71.146 – 10.87.71.147	10.87.71.147
75	10.87.71.148/31	10.87.71.148 – 10.87.71.149	10.87.71.149
76	10.87.71.150/31	10.87.71.150 – 10.87.71.151	10.87.71.151
77	10.87.71.152/31	10.87.71.152 – 10.87.71.153	10.87.71.153
78	10.87.71.154/31	10.87.71.154 – 10.87.71.155	10.87.71.155
79	10.87.71.156/31	10.87.71.156 – 10.87.71.157	10.87.71.157
80	10.87.71.158/31	10.87.71.158 – 10.87.71.159	10.87.71.159
81	10.87.71.160/31	10.87.71.160 – 10.87.71.161	10.87.71.161
82	10.87.71.162/31	10.87.71.162 – 10.87.71.163	10.87.71.163
83	10.87.71.164/31	10.87.71.164 – 10.87.71.165	10.87.71.165
84	10.87.71.166/31	10.87.71.166 – 10.87.71.167	10.87.71.167
85	10.87.71.168/31	10.87.71.168 – 10.87.71.169	10.87.71.169
86	10.87.71.170/31	10.87.71.170 – 10.87.71.171	10.87.71.171
87	10.87.71.172/31	10.87.71.172 – 10.87.71.173	10.87.71.173
88	10.87.71.174/31	10.87.71.174 – 10.87.71.175	10.87.71.175
89	10.87.71.176/31	10.87.71.176 – 10.87.71.177	10.87.71.177
90	10.87.71.178/31	10.87.71.178 – 10.87.71.179	10.87.71.179
91	10.87.71.180/31	10.87.71.180 – 10.87.71.181	10.87.71.181
92	10.87.71.182/31	10.87.71.182 – 10.87.71.183	10.87.71.183
93	10.87.71.184/31	10.87.71.184 – 10.87.71.185	10.87.71.185
94	10.87.71.186/31	10.87.71.186 – 10.87.71.187	10.87.71.187
95	10.87.71.188/31	10.87.71.188 – 10.87.71.189	10.87.71.189
96	10.87.71.190/31	10.87.71.190 – 10.87.71.191	10.87.71.191
97	10.87.71.192/31	10.87.71.192 – 10.87.71.193	10.87.71.193
98	10.87.71.194/31	10.87.71.194 – 10.87.71.195	10.87.71.195
99	10.87.71.196/31	10.87.71.196 – 10.87.71.197	10.87.71.197
100	10.87.71.198/31	10.87.71.198 – 10.87.71.199	10.87.71.199
101	10.87.71.200/31	10.87.71.200 – 10.87.71.201	10.87.71.201
102	10.87.71.202/31	10.87.71.202 – 10.87.71.203	10.87.71.203
103	10.87.71.204/31	10.87.71.204 – 10.87.71.205	10.87.71.205
104	10.87.71.206/31	10.87.71.206 – 10.87.71.207	10.87.71.207
105	10.87.71.208/31	10.87.71.208 – 10.87.71.209	10.87.71.209
106	10.87.71.210/31	10.87.71.210 – 10.87.71.211	10.87.71.211
107	10.87.71.212/31	10.87.71.212 – 10.87.71.213	10.87.71.213
108	10.87.71.214/31	10.87.71.214 – 10.87.71.215	10.87.71.215
109	10.87.71.216/31	10.87.71.216 – 10.87.71.217	10.87.71.217
110	10.87.71.218/31	10.87.71.218 – 10.87.71.219	10.87.71.219
111	10.87.71.220/31	10.87.71.220 – 10.87.71.221	10.87.71.221
112	10.87.71.222/31	10.87.71.222 – 10.87.71.223	10.87.71.223
113	10.87.71.224/31	10.87.71.224 – 10.87.71.225	10.87.71.225
114	10.87.71.226/31	10.87.71.226 – 10.87.71.227	10.87.71.227
115	10.87.71.228/31	10.87.71.228 – 10.87.71.229	10.87.71.229
116	10.87.71.230/31	10.87.71.230 – 10.87.71.231	10.87.71.231
117	10.87.71.232/31	10.87.71.232 – 10.87.71.233	10.87.71.233
118	10.87.71.234/31	10.87.71.234 – 10.87.71.235	10.87.71.235
119	10.87.71.236/31	10.87.71.236 – 10.87.71.237	10.87.71.237
120	10.87.71.238/31	10.87.71.238 – 10.87.71.239	10.87.71.239
121	10.87.71.240/31	10.87.71.240 – 10.87.71.241	10.87.71.241
122	10.87.71.242/31	10.87.71.242 – 10.87.71.243	10.87.71.243
123	10.87.71.244/31	10.87.71.244 – 10.87.71.245	10.87.71.245
124	10.87.71.246/31	10.87.71.246 – 10.87.71.247	10.87.71.247
125	10.87.71.248/31	10.87.71.248 – 10.87.71.249	10.87.71.249
126	10.87.71.250/31	10.87.71.250 – 10.87.71.251	10.87.71.251
127	10.87.71.252/31	10.87.71.252 – 10.87.71.253	10.87.71.253
128	10.87.71.254/31	10.87.71.254 – 10.87.71.255	10.87.71.255

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 →