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)10.3.36.0/24

network10.3.36.0/24

broadcast10.3.36.255

first host10.3.36.1

last host10.3.36.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.36.0/24

address00001010.00000011.00100100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.00100100.00000000

broadcast00001010.00000011.00100100.11111111

green = network part, grey = host part

hex0x0a032400

decimal167977984

reverse dns0.36.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:2400

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.36.0/31	10.3.36.0 – 10.3.36.1	10.3.36.1
2	10.3.36.2/31	10.3.36.2 – 10.3.36.3	10.3.36.3
3	10.3.36.4/31	10.3.36.4 – 10.3.36.5	10.3.36.5
4	10.3.36.6/31	10.3.36.6 – 10.3.36.7	10.3.36.7
5	10.3.36.8/31	10.3.36.8 – 10.3.36.9	10.3.36.9
6	10.3.36.10/31	10.3.36.10 – 10.3.36.11	10.3.36.11
7	10.3.36.12/31	10.3.36.12 – 10.3.36.13	10.3.36.13
8	10.3.36.14/31	10.3.36.14 – 10.3.36.15	10.3.36.15
9	10.3.36.16/31	10.3.36.16 – 10.3.36.17	10.3.36.17
10	10.3.36.18/31	10.3.36.18 – 10.3.36.19	10.3.36.19
11	10.3.36.20/31	10.3.36.20 – 10.3.36.21	10.3.36.21
12	10.3.36.22/31	10.3.36.22 – 10.3.36.23	10.3.36.23
13	10.3.36.24/31	10.3.36.24 – 10.3.36.25	10.3.36.25
14	10.3.36.26/31	10.3.36.26 – 10.3.36.27	10.3.36.27
15	10.3.36.28/31	10.3.36.28 – 10.3.36.29	10.3.36.29
16	10.3.36.30/31	10.3.36.30 – 10.3.36.31	10.3.36.31
17	10.3.36.32/31	10.3.36.32 – 10.3.36.33	10.3.36.33
18	10.3.36.34/31	10.3.36.34 – 10.3.36.35	10.3.36.35
19	10.3.36.36/31	10.3.36.36 – 10.3.36.37	10.3.36.37
20	10.3.36.38/31	10.3.36.38 – 10.3.36.39	10.3.36.39
21	10.3.36.40/31	10.3.36.40 – 10.3.36.41	10.3.36.41
22	10.3.36.42/31	10.3.36.42 – 10.3.36.43	10.3.36.43
23	10.3.36.44/31	10.3.36.44 – 10.3.36.45	10.3.36.45
24	10.3.36.46/31	10.3.36.46 – 10.3.36.47	10.3.36.47
25	10.3.36.48/31	10.3.36.48 – 10.3.36.49	10.3.36.49
26	10.3.36.50/31	10.3.36.50 – 10.3.36.51	10.3.36.51
27	10.3.36.52/31	10.3.36.52 – 10.3.36.53	10.3.36.53
28	10.3.36.54/31	10.3.36.54 – 10.3.36.55	10.3.36.55
29	10.3.36.56/31	10.3.36.56 – 10.3.36.57	10.3.36.57
30	10.3.36.58/31	10.3.36.58 – 10.3.36.59	10.3.36.59
31	10.3.36.60/31	10.3.36.60 – 10.3.36.61	10.3.36.61
32	10.3.36.62/31	10.3.36.62 – 10.3.36.63	10.3.36.63
33	10.3.36.64/31	10.3.36.64 – 10.3.36.65	10.3.36.65
34	10.3.36.66/31	10.3.36.66 – 10.3.36.67	10.3.36.67
35	10.3.36.68/31	10.3.36.68 – 10.3.36.69	10.3.36.69
36	10.3.36.70/31	10.3.36.70 – 10.3.36.71	10.3.36.71
37	10.3.36.72/31	10.3.36.72 – 10.3.36.73	10.3.36.73
38	10.3.36.74/31	10.3.36.74 – 10.3.36.75	10.3.36.75
39	10.3.36.76/31	10.3.36.76 – 10.3.36.77	10.3.36.77
40	10.3.36.78/31	10.3.36.78 – 10.3.36.79	10.3.36.79
41	10.3.36.80/31	10.3.36.80 – 10.3.36.81	10.3.36.81
42	10.3.36.82/31	10.3.36.82 – 10.3.36.83	10.3.36.83
43	10.3.36.84/31	10.3.36.84 – 10.3.36.85	10.3.36.85
44	10.3.36.86/31	10.3.36.86 – 10.3.36.87	10.3.36.87
45	10.3.36.88/31	10.3.36.88 – 10.3.36.89	10.3.36.89
46	10.3.36.90/31	10.3.36.90 – 10.3.36.91	10.3.36.91
47	10.3.36.92/31	10.3.36.92 – 10.3.36.93	10.3.36.93
48	10.3.36.94/31	10.3.36.94 – 10.3.36.95	10.3.36.95
49	10.3.36.96/31	10.3.36.96 – 10.3.36.97	10.3.36.97
50	10.3.36.98/31	10.3.36.98 – 10.3.36.99	10.3.36.99
51	10.3.36.100/31	10.3.36.100 – 10.3.36.101	10.3.36.101
52	10.3.36.102/31	10.3.36.102 – 10.3.36.103	10.3.36.103
53	10.3.36.104/31	10.3.36.104 – 10.3.36.105	10.3.36.105
54	10.3.36.106/31	10.3.36.106 – 10.3.36.107	10.3.36.107
55	10.3.36.108/31	10.3.36.108 – 10.3.36.109	10.3.36.109
56	10.3.36.110/31	10.3.36.110 – 10.3.36.111	10.3.36.111
57	10.3.36.112/31	10.3.36.112 – 10.3.36.113	10.3.36.113
58	10.3.36.114/31	10.3.36.114 – 10.3.36.115	10.3.36.115
59	10.3.36.116/31	10.3.36.116 – 10.3.36.117	10.3.36.117
60	10.3.36.118/31	10.3.36.118 – 10.3.36.119	10.3.36.119
61	10.3.36.120/31	10.3.36.120 – 10.3.36.121	10.3.36.121
62	10.3.36.122/31	10.3.36.122 – 10.3.36.123	10.3.36.123
63	10.3.36.124/31	10.3.36.124 – 10.3.36.125	10.3.36.125
64	10.3.36.126/31	10.3.36.126 – 10.3.36.127	10.3.36.127
65	10.3.36.128/31	10.3.36.128 – 10.3.36.129	10.3.36.129
66	10.3.36.130/31	10.3.36.130 – 10.3.36.131	10.3.36.131
67	10.3.36.132/31	10.3.36.132 – 10.3.36.133	10.3.36.133
68	10.3.36.134/31	10.3.36.134 – 10.3.36.135	10.3.36.135
69	10.3.36.136/31	10.3.36.136 – 10.3.36.137	10.3.36.137
70	10.3.36.138/31	10.3.36.138 – 10.3.36.139	10.3.36.139
71	10.3.36.140/31	10.3.36.140 – 10.3.36.141	10.3.36.141
72	10.3.36.142/31	10.3.36.142 – 10.3.36.143	10.3.36.143
73	10.3.36.144/31	10.3.36.144 – 10.3.36.145	10.3.36.145
74	10.3.36.146/31	10.3.36.146 – 10.3.36.147	10.3.36.147
75	10.3.36.148/31	10.3.36.148 – 10.3.36.149	10.3.36.149
76	10.3.36.150/31	10.3.36.150 – 10.3.36.151	10.3.36.151
77	10.3.36.152/31	10.3.36.152 – 10.3.36.153	10.3.36.153
78	10.3.36.154/31	10.3.36.154 – 10.3.36.155	10.3.36.155
79	10.3.36.156/31	10.3.36.156 – 10.3.36.157	10.3.36.157
80	10.3.36.158/31	10.3.36.158 – 10.3.36.159	10.3.36.159
81	10.3.36.160/31	10.3.36.160 – 10.3.36.161	10.3.36.161
82	10.3.36.162/31	10.3.36.162 – 10.3.36.163	10.3.36.163
83	10.3.36.164/31	10.3.36.164 – 10.3.36.165	10.3.36.165
84	10.3.36.166/31	10.3.36.166 – 10.3.36.167	10.3.36.167
85	10.3.36.168/31	10.3.36.168 – 10.3.36.169	10.3.36.169
86	10.3.36.170/31	10.3.36.170 – 10.3.36.171	10.3.36.171
87	10.3.36.172/31	10.3.36.172 – 10.3.36.173	10.3.36.173
88	10.3.36.174/31	10.3.36.174 – 10.3.36.175	10.3.36.175
89	10.3.36.176/31	10.3.36.176 – 10.3.36.177	10.3.36.177
90	10.3.36.178/31	10.3.36.178 – 10.3.36.179	10.3.36.179
91	10.3.36.180/31	10.3.36.180 – 10.3.36.181	10.3.36.181
92	10.3.36.182/31	10.3.36.182 – 10.3.36.183	10.3.36.183
93	10.3.36.184/31	10.3.36.184 – 10.3.36.185	10.3.36.185
94	10.3.36.186/31	10.3.36.186 – 10.3.36.187	10.3.36.187
95	10.3.36.188/31	10.3.36.188 – 10.3.36.189	10.3.36.189
96	10.3.36.190/31	10.3.36.190 – 10.3.36.191	10.3.36.191
97	10.3.36.192/31	10.3.36.192 – 10.3.36.193	10.3.36.193
98	10.3.36.194/31	10.3.36.194 – 10.3.36.195	10.3.36.195
99	10.3.36.196/31	10.3.36.196 – 10.3.36.197	10.3.36.197
100	10.3.36.198/31	10.3.36.198 – 10.3.36.199	10.3.36.199
101	10.3.36.200/31	10.3.36.200 – 10.3.36.201	10.3.36.201
102	10.3.36.202/31	10.3.36.202 – 10.3.36.203	10.3.36.203
103	10.3.36.204/31	10.3.36.204 – 10.3.36.205	10.3.36.205
104	10.3.36.206/31	10.3.36.206 – 10.3.36.207	10.3.36.207
105	10.3.36.208/31	10.3.36.208 – 10.3.36.209	10.3.36.209
106	10.3.36.210/31	10.3.36.210 – 10.3.36.211	10.3.36.211
107	10.3.36.212/31	10.3.36.212 – 10.3.36.213	10.3.36.213
108	10.3.36.214/31	10.3.36.214 – 10.3.36.215	10.3.36.215
109	10.3.36.216/31	10.3.36.216 – 10.3.36.217	10.3.36.217
110	10.3.36.218/31	10.3.36.218 – 10.3.36.219	10.3.36.219
111	10.3.36.220/31	10.3.36.220 – 10.3.36.221	10.3.36.221
112	10.3.36.222/31	10.3.36.222 – 10.3.36.223	10.3.36.223
113	10.3.36.224/31	10.3.36.224 – 10.3.36.225	10.3.36.225
114	10.3.36.226/31	10.3.36.226 – 10.3.36.227	10.3.36.227
115	10.3.36.228/31	10.3.36.228 – 10.3.36.229	10.3.36.229
116	10.3.36.230/31	10.3.36.230 – 10.3.36.231	10.3.36.231
117	10.3.36.232/31	10.3.36.232 – 10.3.36.233	10.3.36.233
118	10.3.36.234/31	10.3.36.234 – 10.3.36.235	10.3.36.235
119	10.3.36.236/31	10.3.36.236 – 10.3.36.237	10.3.36.237
120	10.3.36.238/31	10.3.36.238 – 10.3.36.239	10.3.36.239
121	10.3.36.240/31	10.3.36.240 – 10.3.36.241	10.3.36.241
122	10.3.36.242/31	10.3.36.242 – 10.3.36.243	10.3.36.243
123	10.3.36.244/31	10.3.36.244 – 10.3.36.245	10.3.36.245
124	10.3.36.246/31	10.3.36.246 – 10.3.36.247	10.3.36.247
125	10.3.36.248/31	10.3.36.248 – 10.3.36.249	10.3.36.249
126	10.3.36.250/31	10.3.36.250 – 10.3.36.251	10.3.36.251
127	10.3.36.252/31	10.3.36.252 – 10.3.36.253	10.3.36.253
128	10.3.36.254/31	10.3.36.254 – 10.3.36.255	10.3.36.255

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 →