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)10.87.55.0/24

network10.87.55.0/24

broadcast10.87.55.255

first host10.87.55.1

last host10.87.55.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.87.55.0/24

address00001010.01010111.00110111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01010111.00110111.00000000

broadcast00001010.01010111.00110111.11111111

green = network part, grey = host part

hex0x0a573700

decimal173487872

reverse dns0.55.87.10.in-addr.arpa

ipv4-mapped::ffff:a57:3700

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.87.55.0/31	10.87.55.0 – 10.87.55.1	10.87.55.1
2	10.87.55.2/31	10.87.55.2 – 10.87.55.3	10.87.55.3
3	10.87.55.4/31	10.87.55.4 – 10.87.55.5	10.87.55.5
4	10.87.55.6/31	10.87.55.6 – 10.87.55.7	10.87.55.7
5	10.87.55.8/31	10.87.55.8 – 10.87.55.9	10.87.55.9
6	10.87.55.10/31	10.87.55.10 – 10.87.55.11	10.87.55.11
7	10.87.55.12/31	10.87.55.12 – 10.87.55.13	10.87.55.13
8	10.87.55.14/31	10.87.55.14 – 10.87.55.15	10.87.55.15
9	10.87.55.16/31	10.87.55.16 – 10.87.55.17	10.87.55.17
10	10.87.55.18/31	10.87.55.18 – 10.87.55.19	10.87.55.19
11	10.87.55.20/31	10.87.55.20 – 10.87.55.21	10.87.55.21
12	10.87.55.22/31	10.87.55.22 – 10.87.55.23	10.87.55.23
13	10.87.55.24/31	10.87.55.24 – 10.87.55.25	10.87.55.25
14	10.87.55.26/31	10.87.55.26 – 10.87.55.27	10.87.55.27
15	10.87.55.28/31	10.87.55.28 – 10.87.55.29	10.87.55.29
16	10.87.55.30/31	10.87.55.30 – 10.87.55.31	10.87.55.31
17	10.87.55.32/31	10.87.55.32 – 10.87.55.33	10.87.55.33
18	10.87.55.34/31	10.87.55.34 – 10.87.55.35	10.87.55.35
19	10.87.55.36/31	10.87.55.36 – 10.87.55.37	10.87.55.37
20	10.87.55.38/31	10.87.55.38 – 10.87.55.39	10.87.55.39
21	10.87.55.40/31	10.87.55.40 – 10.87.55.41	10.87.55.41
22	10.87.55.42/31	10.87.55.42 – 10.87.55.43	10.87.55.43
23	10.87.55.44/31	10.87.55.44 – 10.87.55.45	10.87.55.45
24	10.87.55.46/31	10.87.55.46 – 10.87.55.47	10.87.55.47
25	10.87.55.48/31	10.87.55.48 – 10.87.55.49	10.87.55.49
26	10.87.55.50/31	10.87.55.50 – 10.87.55.51	10.87.55.51
27	10.87.55.52/31	10.87.55.52 – 10.87.55.53	10.87.55.53
28	10.87.55.54/31	10.87.55.54 – 10.87.55.55	10.87.55.55
29	10.87.55.56/31	10.87.55.56 – 10.87.55.57	10.87.55.57
30	10.87.55.58/31	10.87.55.58 – 10.87.55.59	10.87.55.59
31	10.87.55.60/31	10.87.55.60 – 10.87.55.61	10.87.55.61
32	10.87.55.62/31	10.87.55.62 – 10.87.55.63	10.87.55.63
33	10.87.55.64/31	10.87.55.64 – 10.87.55.65	10.87.55.65
34	10.87.55.66/31	10.87.55.66 – 10.87.55.67	10.87.55.67
35	10.87.55.68/31	10.87.55.68 – 10.87.55.69	10.87.55.69
36	10.87.55.70/31	10.87.55.70 – 10.87.55.71	10.87.55.71
37	10.87.55.72/31	10.87.55.72 – 10.87.55.73	10.87.55.73
38	10.87.55.74/31	10.87.55.74 – 10.87.55.75	10.87.55.75
39	10.87.55.76/31	10.87.55.76 – 10.87.55.77	10.87.55.77
40	10.87.55.78/31	10.87.55.78 – 10.87.55.79	10.87.55.79
41	10.87.55.80/31	10.87.55.80 – 10.87.55.81	10.87.55.81
42	10.87.55.82/31	10.87.55.82 – 10.87.55.83	10.87.55.83
43	10.87.55.84/31	10.87.55.84 – 10.87.55.85	10.87.55.85
44	10.87.55.86/31	10.87.55.86 – 10.87.55.87	10.87.55.87
45	10.87.55.88/31	10.87.55.88 – 10.87.55.89	10.87.55.89
46	10.87.55.90/31	10.87.55.90 – 10.87.55.91	10.87.55.91
47	10.87.55.92/31	10.87.55.92 – 10.87.55.93	10.87.55.93
48	10.87.55.94/31	10.87.55.94 – 10.87.55.95	10.87.55.95
49	10.87.55.96/31	10.87.55.96 – 10.87.55.97	10.87.55.97
50	10.87.55.98/31	10.87.55.98 – 10.87.55.99	10.87.55.99
51	10.87.55.100/31	10.87.55.100 – 10.87.55.101	10.87.55.101
52	10.87.55.102/31	10.87.55.102 – 10.87.55.103	10.87.55.103
53	10.87.55.104/31	10.87.55.104 – 10.87.55.105	10.87.55.105
54	10.87.55.106/31	10.87.55.106 – 10.87.55.107	10.87.55.107
55	10.87.55.108/31	10.87.55.108 – 10.87.55.109	10.87.55.109
56	10.87.55.110/31	10.87.55.110 – 10.87.55.111	10.87.55.111
57	10.87.55.112/31	10.87.55.112 – 10.87.55.113	10.87.55.113
58	10.87.55.114/31	10.87.55.114 – 10.87.55.115	10.87.55.115
59	10.87.55.116/31	10.87.55.116 – 10.87.55.117	10.87.55.117
60	10.87.55.118/31	10.87.55.118 – 10.87.55.119	10.87.55.119
61	10.87.55.120/31	10.87.55.120 – 10.87.55.121	10.87.55.121
62	10.87.55.122/31	10.87.55.122 – 10.87.55.123	10.87.55.123
63	10.87.55.124/31	10.87.55.124 – 10.87.55.125	10.87.55.125
64	10.87.55.126/31	10.87.55.126 – 10.87.55.127	10.87.55.127
65	10.87.55.128/31	10.87.55.128 – 10.87.55.129	10.87.55.129
66	10.87.55.130/31	10.87.55.130 – 10.87.55.131	10.87.55.131
67	10.87.55.132/31	10.87.55.132 – 10.87.55.133	10.87.55.133
68	10.87.55.134/31	10.87.55.134 – 10.87.55.135	10.87.55.135
69	10.87.55.136/31	10.87.55.136 – 10.87.55.137	10.87.55.137
70	10.87.55.138/31	10.87.55.138 – 10.87.55.139	10.87.55.139
71	10.87.55.140/31	10.87.55.140 – 10.87.55.141	10.87.55.141
72	10.87.55.142/31	10.87.55.142 – 10.87.55.143	10.87.55.143
73	10.87.55.144/31	10.87.55.144 – 10.87.55.145	10.87.55.145
74	10.87.55.146/31	10.87.55.146 – 10.87.55.147	10.87.55.147
75	10.87.55.148/31	10.87.55.148 – 10.87.55.149	10.87.55.149
76	10.87.55.150/31	10.87.55.150 – 10.87.55.151	10.87.55.151
77	10.87.55.152/31	10.87.55.152 – 10.87.55.153	10.87.55.153
78	10.87.55.154/31	10.87.55.154 – 10.87.55.155	10.87.55.155
79	10.87.55.156/31	10.87.55.156 – 10.87.55.157	10.87.55.157
80	10.87.55.158/31	10.87.55.158 – 10.87.55.159	10.87.55.159
81	10.87.55.160/31	10.87.55.160 – 10.87.55.161	10.87.55.161
82	10.87.55.162/31	10.87.55.162 – 10.87.55.163	10.87.55.163
83	10.87.55.164/31	10.87.55.164 – 10.87.55.165	10.87.55.165
84	10.87.55.166/31	10.87.55.166 – 10.87.55.167	10.87.55.167
85	10.87.55.168/31	10.87.55.168 – 10.87.55.169	10.87.55.169
86	10.87.55.170/31	10.87.55.170 – 10.87.55.171	10.87.55.171
87	10.87.55.172/31	10.87.55.172 – 10.87.55.173	10.87.55.173
88	10.87.55.174/31	10.87.55.174 – 10.87.55.175	10.87.55.175
89	10.87.55.176/31	10.87.55.176 – 10.87.55.177	10.87.55.177
90	10.87.55.178/31	10.87.55.178 – 10.87.55.179	10.87.55.179
91	10.87.55.180/31	10.87.55.180 – 10.87.55.181	10.87.55.181
92	10.87.55.182/31	10.87.55.182 – 10.87.55.183	10.87.55.183
93	10.87.55.184/31	10.87.55.184 – 10.87.55.185	10.87.55.185
94	10.87.55.186/31	10.87.55.186 – 10.87.55.187	10.87.55.187
95	10.87.55.188/31	10.87.55.188 – 10.87.55.189	10.87.55.189
96	10.87.55.190/31	10.87.55.190 – 10.87.55.191	10.87.55.191
97	10.87.55.192/31	10.87.55.192 – 10.87.55.193	10.87.55.193
98	10.87.55.194/31	10.87.55.194 – 10.87.55.195	10.87.55.195
99	10.87.55.196/31	10.87.55.196 – 10.87.55.197	10.87.55.197
100	10.87.55.198/31	10.87.55.198 – 10.87.55.199	10.87.55.199
101	10.87.55.200/31	10.87.55.200 – 10.87.55.201	10.87.55.201
102	10.87.55.202/31	10.87.55.202 – 10.87.55.203	10.87.55.203
103	10.87.55.204/31	10.87.55.204 – 10.87.55.205	10.87.55.205
104	10.87.55.206/31	10.87.55.206 – 10.87.55.207	10.87.55.207
105	10.87.55.208/31	10.87.55.208 – 10.87.55.209	10.87.55.209
106	10.87.55.210/31	10.87.55.210 – 10.87.55.211	10.87.55.211
107	10.87.55.212/31	10.87.55.212 – 10.87.55.213	10.87.55.213
108	10.87.55.214/31	10.87.55.214 – 10.87.55.215	10.87.55.215
109	10.87.55.216/31	10.87.55.216 – 10.87.55.217	10.87.55.217
110	10.87.55.218/31	10.87.55.218 – 10.87.55.219	10.87.55.219
111	10.87.55.220/31	10.87.55.220 – 10.87.55.221	10.87.55.221
112	10.87.55.222/31	10.87.55.222 – 10.87.55.223	10.87.55.223
113	10.87.55.224/31	10.87.55.224 – 10.87.55.225	10.87.55.225
114	10.87.55.226/31	10.87.55.226 – 10.87.55.227	10.87.55.227
115	10.87.55.228/31	10.87.55.228 – 10.87.55.229	10.87.55.229
116	10.87.55.230/31	10.87.55.230 – 10.87.55.231	10.87.55.231
117	10.87.55.232/31	10.87.55.232 – 10.87.55.233	10.87.55.233
118	10.87.55.234/31	10.87.55.234 – 10.87.55.235	10.87.55.235
119	10.87.55.236/31	10.87.55.236 – 10.87.55.237	10.87.55.237
120	10.87.55.238/31	10.87.55.238 – 10.87.55.239	10.87.55.239
121	10.87.55.240/31	10.87.55.240 – 10.87.55.241	10.87.55.241
122	10.87.55.242/31	10.87.55.242 – 10.87.55.243	10.87.55.243
123	10.87.55.244/31	10.87.55.244 – 10.87.55.245	10.87.55.245
124	10.87.55.246/31	10.87.55.246 – 10.87.55.247	10.87.55.247
125	10.87.55.248/31	10.87.55.248 – 10.87.55.249	10.87.55.249
126	10.87.55.250/31	10.87.55.250 – 10.87.55.251	10.87.55.251
127	10.87.55.252/31	10.87.55.252 – 10.87.55.253	10.87.55.253
128	10.87.55.254/31	10.87.55.254 – 10.87.55.255	10.87.55.255

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 →