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)10.3.25.0/24

network10.3.25.0/24

broadcast10.3.25.255

first host10.3.25.1

last host10.3.25.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.25.0/24

address00001010.00000011.00011001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.00011001.00000000

broadcast00001010.00000011.00011001.11111111

green = network part, grey = host part

hex0x0a031900

decimal167975168

reverse dns0.25.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:1900

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.25.0/31	10.3.25.0 – 10.3.25.1	10.3.25.1
2	10.3.25.2/31	10.3.25.2 – 10.3.25.3	10.3.25.3
3	10.3.25.4/31	10.3.25.4 – 10.3.25.5	10.3.25.5
4	10.3.25.6/31	10.3.25.6 – 10.3.25.7	10.3.25.7
5	10.3.25.8/31	10.3.25.8 – 10.3.25.9	10.3.25.9
6	10.3.25.10/31	10.3.25.10 – 10.3.25.11	10.3.25.11
7	10.3.25.12/31	10.3.25.12 – 10.3.25.13	10.3.25.13
8	10.3.25.14/31	10.3.25.14 – 10.3.25.15	10.3.25.15
9	10.3.25.16/31	10.3.25.16 – 10.3.25.17	10.3.25.17
10	10.3.25.18/31	10.3.25.18 – 10.3.25.19	10.3.25.19
11	10.3.25.20/31	10.3.25.20 – 10.3.25.21	10.3.25.21
12	10.3.25.22/31	10.3.25.22 – 10.3.25.23	10.3.25.23
13	10.3.25.24/31	10.3.25.24 – 10.3.25.25	10.3.25.25
14	10.3.25.26/31	10.3.25.26 – 10.3.25.27	10.3.25.27
15	10.3.25.28/31	10.3.25.28 – 10.3.25.29	10.3.25.29
16	10.3.25.30/31	10.3.25.30 – 10.3.25.31	10.3.25.31
17	10.3.25.32/31	10.3.25.32 – 10.3.25.33	10.3.25.33
18	10.3.25.34/31	10.3.25.34 – 10.3.25.35	10.3.25.35
19	10.3.25.36/31	10.3.25.36 – 10.3.25.37	10.3.25.37
20	10.3.25.38/31	10.3.25.38 – 10.3.25.39	10.3.25.39
21	10.3.25.40/31	10.3.25.40 – 10.3.25.41	10.3.25.41
22	10.3.25.42/31	10.3.25.42 – 10.3.25.43	10.3.25.43
23	10.3.25.44/31	10.3.25.44 – 10.3.25.45	10.3.25.45
24	10.3.25.46/31	10.3.25.46 – 10.3.25.47	10.3.25.47
25	10.3.25.48/31	10.3.25.48 – 10.3.25.49	10.3.25.49
26	10.3.25.50/31	10.3.25.50 – 10.3.25.51	10.3.25.51
27	10.3.25.52/31	10.3.25.52 – 10.3.25.53	10.3.25.53
28	10.3.25.54/31	10.3.25.54 – 10.3.25.55	10.3.25.55
29	10.3.25.56/31	10.3.25.56 – 10.3.25.57	10.3.25.57
30	10.3.25.58/31	10.3.25.58 – 10.3.25.59	10.3.25.59
31	10.3.25.60/31	10.3.25.60 – 10.3.25.61	10.3.25.61
32	10.3.25.62/31	10.3.25.62 – 10.3.25.63	10.3.25.63
33	10.3.25.64/31	10.3.25.64 – 10.3.25.65	10.3.25.65
34	10.3.25.66/31	10.3.25.66 – 10.3.25.67	10.3.25.67
35	10.3.25.68/31	10.3.25.68 – 10.3.25.69	10.3.25.69
36	10.3.25.70/31	10.3.25.70 – 10.3.25.71	10.3.25.71
37	10.3.25.72/31	10.3.25.72 – 10.3.25.73	10.3.25.73
38	10.3.25.74/31	10.3.25.74 – 10.3.25.75	10.3.25.75
39	10.3.25.76/31	10.3.25.76 – 10.3.25.77	10.3.25.77
40	10.3.25.78/31	10.3.25.78 – 10.3.25.79	10.3.25.79
41	10.3.25.80/31	10.3.25.80 – 10.3.25.81	10.3.25.81
42	10.3.25.82/31	10.3.25.82 – 10.3.25.83	10.3.25.83
43	10.3.25.84/31	10.3.25.84 – 10.3.25.85	10.3.25.85
44	10.3.25.86/31	10.3.25.86 – 10.3.25.87	10.3.25.87
45	10.3.25.88/31	10.3.25.88 – 10.3.25.89	10.3.25.89
46	10.3.25.90/31	10.3.25.90 – 10.3.25.91	10.3.25.91
47	10.3.25.92/31	10.3.25.92 – 10.3.25.93	10.3.25.93
48	10.3.25.94/31	10.3.25.94 – 10.3.25.95	10.3.25.95
49	10.3.25.96/31	10.3.25.96 – 10.3.25.97	10.3.25.97
50	10.3.25.98/31	10.3.25.98 – 10.3.25.99	10.3.25.99
51	10.3.25.100/31	10.3.25.100 – 10.3.25.101	10.3.25.101
52	10.3.25.102/31	10.3.25.102 – 10.3.25.103	10.3.25.103
53	10.3.25.104/31	10.3.25.104 – 10.3.25.105	10.3.25.105
54	10.3.25.106/31	10.3.25.106 – 10.3.25.107	10.3.25.107
55	10.3.25.108/31	10.3.25.108 – 10.3.25.109	10.3.25.109
56	10.3.25.110/31	10.3.25.110 – 10.3.25.111	10.3.25.111
57	10.3.25.112/31	10.3.25.112 – 10.3.25.113	10.3.25.113
58	10.3.25.114/31	10.3.25.114 – 10.3.25.115	10.3.25.115
59	10.3.25.116/31	10.3.25.116 – 10.3.25.117	10.3.25.117
60	10.3.25.118/31	10.3.25.118 – 10.3.25.119	10.3.25.119
61	10.3.25.120/31	10.3.25.120 – 10.3.25.121	10.3.25.121
62	10.3.25.122/31	10.3.25.122 – 10.3.25.123	10.3.25.123
63	10.3.25.124/31	10.3.25.124 – 10.3.25.125	10.3.25.125
64	10.3.25.126/31	10.3.25.126 – 10.3.25.127	10.3.25.127
65	10.3.25.128/31	10.3.25.128 – 10.3.25.129	10.3.25.129
66	10.3.25.130/31	10.3.25.130 – 10.3.25.131	10.3.25.131
67	10.3.25.132/31	10.3.25.132 – 10.3.25.133	10.3.25.133
68	10.3.25.134/31	10.3.25.134 – 10.3.25.135	10.3.25.135
69	10.3.25.136/31	10.3.25.136 – 10.3.25.137	10.3.25.137
70	10.3.25.138/31	10.3.25.138 – 10.3.25.139	10.3.25.139
71	10.3.25.140/31	10.3.25.140 – 10.3.25.141	10.3.25.141
72	10.3.25.142/31	10.3.25.142 – 10.3.25.143	10.3.25.143
73	10.3.25.144/31	10.3.25.144 – 10.3.25.145	10.3.25.145
74	10.3.25.146/31	10.3.25.146 – 10.3.25.147	10.3.25.147
75	10.3.25.148/31	10.3.25.148 – 10.3.25.149	10.3.25.149
76	10.3.25.150/31	10.3.25.150 – 10.3.25.151	10.3.25.151
77	10.3.25.152/31	10.3.25.152 – 10.3.25.153	10.3.25.153
78	10.3.25.154/31	10.3.25.154 – 10.3.25.155	10.3.25.155
79	10.3.25.156/31	10.3.25.156 – 10.3.25.157	10.3.25.157
80	10.3.25.158/31	10.3.25.158 – 10.3.25.159	10.3.25.159
81	10.3.25.160/31	10.3.25.160 – 10.3.25.161	10.3.25.161
82	10.3.25.162/31	10.3.25.162 – 10.3.25.163	10.3.25.163
83	10.3.25.164/31	10.3.25.164 – 10.3.25.165	10.3.25.165
84	10.3.25.166/31	10.3.25.166 – 10.3.25.167	10.3.25.167
85	10.3.25.168/31	10.3.25.168 – 10.3.25.169	10.3.25.169
86	10.3.25.170/31	10.3.25.170 – 10.3.25.171	10.3.25.171
87	10.3.25.172/31	10.3.25.172 – 10.3.25.173	10.3.25.173
88	10.3.25.174/31	10.3.25.174 – 10.3.25.175	10.3.25.175
89	10.3.25.176/31	10.3.25.176 – 10.3.25.177	10.3.25.177
90	10.3.25.178/31	10.3.25.178 – 10.3.25.179	10.3.25.179
91	10.3.25.180/31	10.3.25.180 – 10.3.25.181	10.3.25.181
92	10.3.25.182/31	10.3.25.182 – 10.3.25.183	10.3.25.183
93	10.3.25.184/31	10.3.25.184 – 10.3.25.185	10.3.25.185
94	10.3.25.186/31	10.3.25.186 – 10.3.25.187	10.3.25.187
95	10.3.25.188/31	10.3.25.188 – 10.3.25.189	10.3.25.189
96	10.3.25.190/31	10.3.25.190 – 10.3.25.191	10.3.25.191
97	10.3.25.192/31	10.3.25.192 – 10.3.25.193	10.3.25.193
98	10.3.25.194/31	10.3.25.194 – 10.3.25.195	10.3.25.195
99	10.3.25.196/31	10.3.25.196 – 10.3.25.197	10.3.25.197
100	10.3.25.198/31	10.3.25.198 – 10.3.25.199	10.3.25.199
101	10.3.25.200/31	10.3.25.200 – 10.3.25.201	10.3.25.201
102	10.3.25.202/31	10.3.25.202 – 10.3.25.203	10.3.25.203
103	10.3.25.204/31	10.3.25.204 – 10.3.25.205	10.3.25.205
104	10.3.25.206/31	10.3.25.206 – 10.3.25.207	10.3.25.207
105	10.3.25.208/31	10.3.25.208 – 10.3.25.209	10.3.25.209
106	10.3.25.210/31	10.3.25.210 – 10.3.25.211	10.3.25.211
107	10.3.25.212/31	10.3.25.212 – 10.3.25.213	10.3.25.213
108	10.3.25.214/31	10.3.25.214 – 10.3.25.215	10.3.25.215
109	10.3.25.216/31	10.3.25.216 – 10.3.25.217	10.3.25.217
110	10.3.25.218/31	10.3.25.218 – 10.3.25.219	10.3.25.219
111	10.3.25.220/31	10.3.25.220 – 10.3.25.221	10.3.25.221
112	10.3.25.222/31	10.3.25.222 – 10.3.25.223	10.3.25.223
113	10.3.25.224/31	10.3.25.224 – 10.3.25.225	10.3.25.225
114	10.3.25.226/31	10.3.25.226 – 10.3.25.227	10.3.25.227
115	10.3.25.228/31	10.3.25.228 – 10.3.25.229	10.3.25.229
116	10.3.25.230/31	10.3.25.230 – 10.3.25.231	10.3.25.231
117	10.3.25.232/31	10.3.25.232 – 10.3.25.233	10.3.25.233
118	10.3.25.234/31	10.3.25.234 – 10.3.25.235	10.3.25.235
119	10.3.25.236/31	10.3.25.236 – 10.3.25.237	10.3.25.237
120	10.3.25.238/31	10.3.25.238 – 10.3.25.239	10.3.25.239
121	10.3.25.240/31	10.3.25.240 – 10.3.25.241	10.3.25.241
122	10.3.25.242/31	10.3.25.242 – 10.3.25.243	10.3.25.243
123	10.3.25.244/31	10.3.25.244 – 10.3.25.245	10.3.25.245
124	10.3.25.246/31	10.3.25.246 – 10.3.25.247	10.3.25.247
125	10.3.25.248/31	10.3.25.248 – 10.3.25.249	10.3.25.249
126	10.3.25.250/31	10.3.25.250 – 10.3.25.251	10.3.25.251
127	10.3.25.252/31	10.3.25.252 – 10.3.25.253	10.3.25.253
128	10.3.25.254/31	10.3.25.254 – 10.3.25.255	10.3.25.255

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 →