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)10.2.186.0/24

network10.2.186.0/24

broadcast10.2.186.255

first host10.2.186.1

last host10.2.186.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.186.0/24

address00001010.00000010.10111010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10111010.00000000

broadcast00001010.00000010.10111010.11111111

green = network part, grey = host part

hex0x0a02ba00

decimal167950848

reverse dns0.186.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:ba00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.186.0/31	10.2.186.0 – 10.2.186.1	10.2.186.1
2	10.2.186.2/31	10.2.186.2 – 10.2.186.3	10.2.186.3
3	10.2.186.4/31	10.2.186.4 – 10.2.186.5	10.2.186.5
4	10.2.186.6/31	10.2.186.6 – 10.2.186.7	10.2.186.7
5	10.2.186.8/31	10.2.186.8 – 10.2.186.9	10.2.186.9
6	10.2.186.10/31	10.2.186.10 – 10.2.186.11	10.2.186.11
7	10.2.186.12/31	10.2.186.12 – 10.2.186.13	10.2.186.13
8	10.2.186.14/31	10.2.186.14 – 10.2.186.15	10.2.186.15
9	10.2.186.16/31	10.2.186.16 – 10.2.186.17	10.2.186.17
10	10.2.186.18/31	10.2.186.18 – 10.2.186.19	10.2.186.19
11	10.2.186.20/31	10.2.186.20 – 10.2.186.21	10.2.186.21
12	10.2.186.22/31	10.2.186.22 – 10.2.186.23	10.2.186.23
13	10.2.186.24/31	10.2.186.24 – 10.2.186.25	10.2.186.25
14	10.2.186.26/31	10.2.186.26 – 10.2.186.27	10.2.186.27
15	10.2.186.28/31	10.2.186.28 – 10.2.186.29	10.2.186.29
16	10.2.186.30/31	10.2.186.30 – 10.2.186.31	10.2.186.31
17	10.2.186.32/31	10.2.186.32 – 10.2.186.33	10.2.186.33
18	10.2.186.34/31	10.2.186.34 – 10.2.186.35	10.2.186.35
19	10.2.186.36/31	10.2.186.36 – 10.2.186.37	10.2.186.37
20	10.2.186.38/31	10.2.186.38 – 10.2.186.39	10.2.186.39
21	10.2.186.40/31	10.2.186.40 – 10.2.186.41	10.2.186.41
22	10.2.186.42/31	10.2.186.42 – 10.2.186.43	10.2.186.43
23	10.2.186.44/31	10.2.186.44 – 10.2.186.45	10.2.186.45
24	10.2.186.46/31	10.2.186.46 – 10.2.186.47	10.2.186.47
25	10.2.186.48/31	10.2.186.48 – 10.2.186.49	10.2.186.49
26	10.2.186.50/31	10.2.186.50 – 10.2.186.51	10.2.186.51
27	10.2.186.52/31	10.2.186.52 – 10.2.186.53	10.2.186.53
28	10.2.186.54/31	10.2.186.54 – 10.2.186.55	10.2.186.55
29	10.2.186.56/31	10.2.186.56 – 10.2.186.57	10.2.186.57
30	10.2.186.58/31	10.2.186.58 – 10.2.186.59	10.2.186.59
31	10.2.186.60/31	10.2.186.60 – 10.2.186.61	10.2.186.61
32	10.2.186.62/31	10.2.186.62 – 10.2.186.63	10.2.186.63
33	10.2.186.64/31	10.2.186.64 – 10.2.186.65	10.2.186.65
34	10.2.186.66/31	10.2.186.66 – 10.2.186.67	10.2.186.67
35	10.2.186.68/31	10.2.186.68 – 10.2.186.69	10.2.186.69
36	10.2.186.70/31	10.2.186.70 – 10.2.186.71	10.2.186.71
37	10.2.186.72/31	10.2.186.72 – 10.2.186.73	10.2.186.73
38	10.2.186.74/31	10.2.186.74 – 10.2.186.75	10.2.186.75
39	10.2.186.76/31	10.2.186.76 – 10.2.186.77	10.2.186.77
40	10.2.186.78/31	10.2.186.78 – 10.2.186.79	10.2.186.79
41	10.2.186.80/31	10.2.186.80 – 10.2.186.81	10.2.186.81
42	10.2.186.82/31	10.2.186.82 – 10.2.186.83	10.2.186.83
43	10.2.186.84/31	10.2.186.84 – 10.2.186.85	10.2.186.85
44	10.2.186.86/31	10.2.186.86 – 10.2.186.87	10.2.186.87
45	10.2.186.88/31	10.2.186.88 – 10.2.186.89	10.2.186.89
46	10.2.186.90/31	10.2.186.90 – 10.2.186.91	10.2.186.91
47	10.2.186.92/31	10.2.186.92 – 10.2.186.93	10.2.186.93
48	10.2.186.94/31	10.2.186.94 – 10.2.186.95	10.2.186.95
49	10.2.186.96/31	10.2.186.96 – 10.2.186.97	10.2.186.97
50	10.2.186.98/31	10.2.186.98 – 10.2.186.99	10.2.186.99
51	10.2.186.100/31	10.2.186.100 – 10.2.186.101	10.2.186.101
52	10.2.186.102/31	10.2.186.102 – 10.2.186.103	10.2.186.103
53	10.2.186.104/31	10.2.186.104 – 10.2.186.105	10.2.186.105
54	10.2.186.106/31	10.2.186.106 – 10.2.186.107	10.2.186.107
55	10.2.186.108/31	10.2.186.108 – 10.2.186.109	10.2.186.109
56	10.2.186.110/31	10.2.186.110 – 10.2.186.111	10.2.186.111
57	10.2.186.112/31	10.2.186.112 – 10.2.186.113	10.2.186.113
58	10.2.186.114/31	10.2.186.114 – 10.2.186.115	10.2.186.115
59	10.2.186.116/31	10.2.186.116 – 10.2.186.117	10.2.186.117
60	10.2.186.118/31	10.2.186.118 – 10.2.186.119	10.2.186.119
61	10.2.186.120/31	10.2.186.120 – 10.2.186.121	10.2.186.121
62	10.2.186.122/31	10.2.186.122 – 10.2.186.123	10.2.186.123
63	10.2.186.124/31	10.2.186.124 – 10.2.186.125	10.2.186.125
64	10.2.186.126/31	10.2.186.126 – 10.2.186.127	10.2.186.127
65	10.2.186.128/31	10.2.186.128 – 10.2.186.129	10.2.186.129
66	10.2.186.130/31	10.2.186.130 – 10.2.186.131	10.2.186.131
67	10.2.186.132/31	10.2.186.132 – 10.2.186.133	10.2.186.133
68	10.2.186.134/31	10.2.186.134 – 10.2.186.135	10.2.186.135
69	10.2.186.136/31	10.2.186.136 – 10.2.186.137	10.2.186.137
70	10.2.186.138/31	10.2.186.138 – 10.2.186.139	10.2.186.139
71	10.2.186.140/31	10.2.186.140 – 10.2.186.141	10.2.186.141
72	10.2.186.142/31	10.2.186.142 – 10.2.186.143	10.2.186.143
73	10.2.186.144/31	10.2.186.144 – 10.2.186.145	10.2.186.145
74	10.2.186.146/31	10.2.186.146 – 10.2.186.147	10.2.186.147
75	10.2.186.148/31	10.2.186.148 – 10.2.186.149	10.2.186.149
76	10.2.186.150/31	10.2.186.150 – 10.2.186.151	10.2.186.151
77	10.2.186.152/31	10.2.186.152 – 10.2.186.153	10.2.186.153
78	10.2.186.154/31	10.2.186.154 – 10.2.186.155	10.2.186.155
79	10.2.186.156/31	10.2.186.156 – 10.2.186.157	10.2.186.157
80	10.2.186.158/31	10.2.186.158 – 10.2.186.159	10.2.186.159
81	10.2.186.160/31	10.2.186.160 – 10.2.186.161	10.2.186.161
82	10.2.186.162/31	10.2.186.162 – 10.2.186.163	10.2.186.163
83	10.2.186.164/31	10.2.186.164 – 10.2.186.165	10.2.186.165
84	10.2.186.166/31	10.2.186.166 – 10.2.186.167	10.2.186.167
85	10.2.186.168/31	10.2.186.168 – 10.2.186.169	10.2.186.169
86	10.2.186.170/31	10.2.186.170 – 10.2.186.171	10.2.186.171
87	10.2.186.172/31	10.2.186.172 – 10.2.186.173	10.2.186.173
88	10.2.186.174/31	10.2.186.174 – 10.2.186.175	10.2.186.175
89	10.2.186.176/31	10.2.186.176 – 10.2.186.177	10.2.186.177
90	10.2.186.178/31	10.2.186.178 – 10.2.186.179	10.2.186.179
91	10.2.186.180/31	10.2.186.180 – 10.2.186.181	10.2.186.181
92	10.2.186.182/31	10.2.186.182 – 10.2.186.183	10.2.186.183
93	10.2.186.184/31	10.2.186.184 – 10.2.186.185	10.2.186.185
94	10.2.186.186/31	10.2.186.186 – 10.2.186.187	10.2.186.187
95	10.2.186.188/31	10.2.186.188 – 10.2.186.189	10.2.186.189
96	10.2.186.190/31	10.2.186.190 – 10.2.186.191	10.2.186.191
97	10.2.186.192/31	10.2.186.192 – 10.2.186.193	10.2.186.193
98	10.2.186.194/31	10.2.186.194 – 10.2.186.195	10.2.186.195
99	10.2.186.196/31	10.2.186.196 – 10.2.186.197	10.2.186.197
100	10.2.186.198/31	10.2.186.198 – 10.2.186.199	10.2.186.199
101	10.2.186.200/31	10.2.186.200 – 10.2.186.201	10.2.186.201
102	10.2.186.202/31	10.2.186.202 – 10.2.186.203	10.2.186.203
103	10.2.186.204/31	10.2.186.204 – 10.2.186.205	10.2.186.205
104	10.2.186.206/31	10.2.186.206 – 10.2.186.207	10.2.186.207
105	10.2.186.208/31	10.2.186.208 – 10.2.186.209	10.2.186.209
106	10.2.186.210/31	10.2.186.210 – 10.2.186.211	10.2.186.211
107	10.2.186.212/31	10.2.186.212 – 10.2.186.213	10.2.186.213
108	10.2.186.214/31	10.2.186.214 – 10.2.186.215	10.2.186.215
109	10.2.186.216/31	10.2.186.216 – 10.2.186.217	10.2.186.217
110	10.2.186.218/31	10.2.186.218 – 10.2.186.219	10.2.186.219
111	10.2.186.220/31	10.2.186.220 – 10.2.186.221	10.2.186.221
112	10.2.186.222/31	10.2.186.222 – 10.2.186.223	10.2.186.223
113	10.2.186.224/31	10.2.186.224 – 10.2.186.225	10.2.186.225
114	10.2.186.226/31	10.2.186.226 – 10.2.186.227	10.2.186.227
115	10.2.186.228/31	10.2.186.228 – 10.2.186.229	10.2.186.229
116	10.2.186.230/31	10.2.186.230 – 10.2.186.231	10.2.186.231
117	10.2.186.232/31	10.2.186.232 – 10.2.186.233	10.2.186.233
118	10.2.186.234/31	10.2.186.234 – 10.2.186.235	10.2.186.235
119	10.2.186.236/31	10.2.186.236 – 10.2.186.237	10.2.186.237
120	10.2.186.238/31	10.2.186.238 – 10.2.186.239	10.2.186.239
121	10.2.186.240/31	10.2.186.240 – 10.2.186.241	10.2.186.241
122	10.2.186.242/31	10.2.186.242 – 10.2.186.243	10.2.186.243
123	10.2.186.244/31	10.2.186.244 – 10.2.186.245	10.2.186.245
124	10.2.186.246/31	10.2.186.246 – 10.2.186.247	10.2.186.247
125	10.2.186.248/31	10.2.186.248 – 10.2.186.249	10.2.186.249
126	10.2.186.250/31	10.2.186.250 – 10.2.186.251	10.2.186.251
127	10.2.186.252/31	10.2.186.252 – 10.2.186.253	10.2.186.253
128	10.2.186.254/31	10.2.186.254 – 10.2.186.255	10.2.186.255

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 →