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)10.0.90.0/24

network10.0.90.0/24

broadcast10.0.90.255

first host10.0.90.1

last host10.0.90.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.90.0/24

address00001010.00000000.01011010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.01011010.00000000

broadcast00001010.00000000.01011010.11111111

green = network part, grey = host part

hex0x0a005a00

decimal167795200

reverse dns0.90.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:5a00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.90.0/31	10.0.90.0 – 10.0.90.1	10.0.90.1
2	10.0.90.2/31	10.0.90.2 – 10.0.90.3	10.0.90.3
3	10.0.90.4/31	10.0.90.4 – 10.0.90.5	10.0.90.5
4	10.0.90.6/31	10.0.90.6 – 10.0.90.7	10.0.90.7
5	10.0.90.8/31	10.0.90.8 – 10.0.90.9	10.0.90.9
6	10.0.90.10/31	10.0.90.10 – 10.0.90.11	10.0.90.11
7	10.0.90.12/31	10.0.90.12 – 10.0.90.13	10.0.90.13
8	10.0.90.14/31	10.0.90.14 – 10.0.90.15	10.0.90.15
9	10.0.90.16/31	10.0.90.16 – 10.0.90.17	10.0.90.17
10	10.0.90.18/31	10.0.90.18 – 10.0.90.19	10.0.90.19
11	10.0.90.20/31	10.0.90.20 – 10.0.90.21	10.0.90.21
12	10.0.90.22/31	10.0.90.22 – 10.0.90.23	10.0.90.23
13	10.0.90.24/31	10.0.90.24 – 10.0.90.25	10.0.90.25
14	10.0.90.26/31	10.0.90.26 – 10.0.90.27	10.0.90.27
15	10.0.90.28/31	10.0.90.28 – 10.0.90.29	10.0.90.29
16	10.0.90.30/31	10.0.90.30 – 10.0.90.31	10.0.90.31
17	10.0.90.32/31	10.0.90.32 – 10.0.90.33	10.0.90.33
18	10.0.90.34/31	10.0.90.34 – 10.0.90.35	10.0.90.35
19	10.0.90.36/31	10.0.90.36 – 10.0.90.37	10.0.90.37
20	10.0.90.38/31	10.0.90.38 – 10.0.90.39	10.0.90.39
21	10.0.90.40/31	10.0.90.40 – 10.0.90.41	10.0.90.41
22	10.0.90.42/31	10.0.90.42 – 10.0.90.43	10.0.90.43
23	10.0.90.44/31	10.0.90.44 – 10.0.90.45	10.0.90.45
24	10.0.90.46/31	10.0.90.46 – 10.0.90.47	10.0.90.47
25	10.0.90.48/31	10.0.90.48 – 10.0.90.49	10.0.90.49
26	10.0.90.50/31	10.0.90.50 – 10.0.90.51	10.0.90.51
27	10.0.90.52/31	10.0.90.52 – 10.0.90.53	10.0.90.53
28	10.0.90.54/31	10.0.90.54 – 10.0.90.55	10.0.90.55
29	10.0.90.56/31	10.0.90.56 – 10.0.90.57	10.0.90.57
30	10.0.90.58/31	10.0.90.58 – 10.0.90.59	10.0.90.59
31	10.0.90.60/31	10.0.90.60 – 10.0.90.61	10.0.90.61
32	10.0.90.62/31	10.0.90.62 – 10.0.90.63	10.0.90.63
33	10.0.90.64/31	10.0.90.64 – 10.0.90.65	10.0.90.65
34	10.0.90.66/31	10.0.90.66 – 10.0.90.67	10.0.90.67
35	10.0.90.68/31	10.0.90.68 – 10.0.90.69	10.0.90.69
36	10.0.90.70/31	10.0.90.70 – 10.0.90.71	10.0.90.71
37	10.0.90.72/31	10.0.90.72 – 10.0.90.73	10.0.90.73
38	10.0.90.74/31	10.0.90.74 – 10.0.90.75	10.0.90.75
39	10.0.90.76/31	10.0.90.76 – 10.0.90.77	10.0.90.77
40	10.0.90.78/31	10.0.90.78 – 10.0.90.79	10.0.90.79
41	10.0.90.80/31	10.0.90.80 – 10.0.90.81	10.0.90.81
42	10.0.90.82/31	10.0.90.82 – 10.0.90.83	10.0.90.83
43	10.0.90.84/31	10.0.90.84 – 10.0.90.85	10.0.90.85
44	10.0.90.86/31	10.0.90.86 – 10.0.90.87	10.0.90.87
45	10.0.90.88/31	10.0.90.88 – 10.0.90.89	10.0.90.89
46	10.0.90.90/31	10.0.90.90 – 10.0.90.91	10.0.90.91
47	10.0.90.92/31	10.0.90.92 – 10.0.90.93	10.0.90.93
48	10.0.90.94/31	10.0.90.94 – 10.0.90.95	10.0.90.95
49	10.0.90.96/31	10.0.90.96 – 10.0.90.97	10.0.90.97
50	10.0.90.98/31	10.0.90.98 – 10.0.90.99	10.0.90.99
51	10.0.90.100/31	10.0.90.100 – 10.0.90.101	10.0.90.101
52	10.0.90.102/31	10.0.90.102 – 10.0.90.103	10.0.90.103
53	10.0.90.104/31	10.0.90.104 – 10.0.90.105	10.0.90.105
54	10.0.90.106/31	10.0.90.106 – 10.0.90.107	10.0.90.107
55	10.0.90.108/31	10.0.90.108 – 10.0.90.109	10.0.90.109
56	10.0.90.110/31	10.0.90.110 – 10.0.90.111	10.0.90.111
57	10.0.90.112/31	10.0.90.112 – 10.0.90.113	10.0.90.113
58	10.0.90.114/31	10.0.90.114 – 10.0.90.115	10.0.90.115
59	10.0.90.116/31	10.0.90.116 – 10.0.90.117	10.0.90.117
60	10.0.90.118/31	10.0.90.118 – 10.0.90.119	10.0.90.119
61	10.0.90.120/31	10.0.90.120 – 10.0.90.121	10.0.90.121
62	10.0.90.122/31	10.0.90.122 – 10.0.90.123	10.0.90.123
63	10.0.90.124/31	10.0.90.124 – 10.0.90.125	10.0.90.125
64	10.0.90.126/31	10.0.90.126 – 10.0.90.127	10.0.90.127
65	10.0.90.128/31	10.0.90.128 – 10.0.90.129	10.0.90.129
66	10.0.90.130/31	10.0.90.130 – 10.0.90.131	10.0.90.131
67	10.0.90.132/31	10.0.90.132 – 10.0.90.133	10.0.90.133
68	10.0.90.134/31	10.0.90.134 – 10.0.90.135	10.0.90.135
69	10.0.90.136/31	10.0.90.136 – 10.0.90.137	10.0.90.137
70	10.0.90.138/31	10.0.90.138 – 10.0.90.139	10.0.90.139
71	10.0.90.140/31	10.0.90.140 – 10.0.90.141	10.0.90.141
72	10.0.90.142/31	10.0.90.142 – 10.0.90.143	10.0.90.143
73	10.0.90.144/31	10.0.90.144 – 10.0.90.145	10.0.90.145
74	10.0.90.146/31	10.0.90.146 – 10.0.90.147	10.0.90.147
75	10.0.90.148/31	10.0.90.148 – 10.0.90.149	10.0.90.149
76	10.0.90.150/31	10.0.90.150 – 10.0.90.151	10.0.90.151
77	10.0.90.152/31	10.0.90.152 – 10.0.90.153	10.0.90.153
78	10.0.90.154/31	10.0.90.154 – 10.0.90.155	10.0.90.155
79	10.0.90.156/31	10.0.90.156 – 10.0.90.157	10.0.90.157
80	10.0.90.158/31	10.0.90.158 – 10.0.90.159	10.0.90.159
81	10.0.90.160/31	10.0.90.160 – 10.0.90.161	10.0.90.161
82	10.0.90.162/31	10.0.90.162 – 10.0.90.163	10.0.90.163
83	10.0.90.164/31	10.0.90.164 – 10.0.90.165	10.0.90.165
84	10.0.90.166/31	10.0.90.166 – 10.0.90.167	10.0.90.167
85	10.0.90.168/31	10.0.90.168 – 10.0.90.169	10.0.90.169
86	10.0.90.170/31	10.0.90.170 – 10.0.90.171	10.0.90.171
87	10.0.90.172/31	10.0.90.172 – 10.0.90.173	10.0.90.173
88	10.0.90.174/31	10.0.90.174 – 10.0.90.175	10.0.90.175
89	10.0.90.176/31	10.0.90.176 – 10.0.90.177	10.0.90.177
90	10.0.90.178/31	10.0.90.178 – 10.0.90.179	10.0.90.179
91	10.0.90.180/31	10.0.90.180 – 10.0.90.181	10.0.90.181
92	10.0.90.182/31	10.0.90.182 – 10.0.90.183	10.0.90.183
93	10.0.90.184/31	10.0.90.184 – 10.0.90.185	10.0.90.185
94	10.0.90.186/31	10.0.90.186 – 10.0.90.187	10.0.90.187
95	10.0.90.188/31	10.0.90.188 – 10.0.90.189	10.0.90.189
96	10.0.90.190/31	10.0.90.190 – 10.0.90.191	10.0.90.191
97	10.0.90.192/31	10.0.90.192 – 10.0.90.193	10.0.90.193
98	10.0.90.194/31	10.0.90.194 – 10.0.90.195	10.0.90.195
99	10.0.90.196/31	10.0.90.196 – 10.0.90.197	10.0.90.197
100	10.0.90.198/31	10.0.90.198 – 10.0.90.199	10.0.90.199
101	10.0.90.200/31	10.0.90.200 – 10.0.90.201	10.0.90.201
102	10.0.90.202/31	10.0.90.202 – 10.0.90.203	10.0.90.203
103	10.0.90.204/31	10.0.90.204 – 10.0.90.205	10.0.90.205
104	10.0.90.206/31	10.0.90.206 – 10.0.90.207	10.0.90.207
105	10.0.90.208/31	10.0.90.208 – 10.0.90.209	10.0.90.209
106	10.0.90.210/31	10.0.90.210 – 10.0.90.211	10.0.90.211
107	10.0.90.212/31	10.0.90.212 – 10.0.90.213	10.0.90.213
108	10.0.90.214/31	10.0.90.214 – 10.0.90.215	10.0.90.215
109	10.0.90.216/31	10.0.90.216 – 10.0.90.217	10.0.90.217
110	10.0.90.218/31	10.0.90.218 – 10.0.90.219	10.0.90.219
111	10.0.90.220/31	10.0.90.220 – 10.0.90.221	10.0.90.221
112	10.0.90.222/31	10.0.90.222 – 10.0.90.223	10.0.90.223
113	10.0.90.224/31	10.0.90.224 – 10.0.90.225	10.0.90.225
114	10.0.90.226/31	10.0.90.226 – 10.0.90.227	10.0.90.227
115	10.0.90.228/31	10.0.90.228 – 10.0.90.229	10.0.90.229
116	10.0.90.230/31	10.0.90.230 – 10.0.90.231	10.0.90.231
117	10.0.90.232/31	10.0.90.232 – 10.0.90.233	10.0.90.233
118	10.0.90.234/31	10.0.90.234 – 10.0.90.235	10.0.90.235
119	10.0.90.236/31	10.0.90.236 – 10.0.90.237	10.0.90.237
120	10.0.90.238/31	10.0.90.238 – 10.0.90.239	10.0.90.239
121	10.0.90.240/31	10.0.90.240 – 10.0.90.241	10.0.90.241
122	10.0.90.242/31	10.0.90.242 – 10.0.90.243	10.0.90.243
123	10.0.90.244/31	10.0.90.244 – 10.0.90.245	10.0.90.245
124	10.0.90.246/31	10.0.90.246 – 10.0.90.247	10.0.90.247
125	10.0.90.248/31	10.0.90.248 – 10.0.90.249	10.0.90.249
126	10.0.90.250/31	10.0.90.250 – 10.0.90.251	10.0.90.251
127	10.0.90.252/31	10.0.90.252 – 10.0.90.253	10.0.90.253
128	10.0.90.254/31	10.0.90.254 – 10.0.90.255	10.0.90.255

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 →