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)10.2.13.0/24

network10.2.13.0/24

broadcast10.2.13.255

first host10.2.13.1

last host10.2.13.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.13.0/24

address00001010.00000010.00001101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.00001101.00000000

broadcast00001010.00000010.00001101.11111111

green = network part, grey = host part

hex0x0a020d00

decimal167906560

reverse dns0.13.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:d00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.13.0/31	10.2.13.0 – 10.2.13.1	10.2.13.1
2	10.2.13.2/31	10.2.13.2 – 10.2.13.3	10.2.13.3
3	10.2.13.4/31	10.2.13.4 – 10.2.13.5	10.2.13.5
4	10.2.13.6/31	10.2.13.6 – 10.2.13.7	10.2.13.7
5	10.2.13.8/31	10.2.13.8 – 10.2.13.9	10.2.13.9
6	10.2.13.10/31	10.2.13.10 – 10.2.13.11	10.2.13.11
7	10.2.13.12/31	10.2.13.12 – 10.2.13.13	10.2.13.13
8	10.2.13.14/31	10.2.13.14 – 10.2.13.15	10.2.13.15
9	10.2.13.16/31	10.2.13.16 – 10.2.13.17	10.2.13.17
10	10.2.13.18/31	10.2.13.18 – 10.2.13.19	10.2.13.19
11	10.2.13.20/31	10.2.13.20 – 10.2.13.21	10.2.13.21
12	10.2.13.22/31	10.2.13.22 – 10.2.13.23	10.2.13.23
13	10.2.13.24/31	10.2.13.24 – 10.2.13.25	10.2.13.25
14	10.2.13.26/31	10.2.13.26 – 10.2.13.27	10.2.13.27
15	10.2.13.28/31	10.2.13.28 – 10.2.13.29	10.2.13.29
16	10.2.13.30/31	10.2.13.30 – 10.2.13.31	10.2.13.31
17	10.2.13.32/31	10.2.13.32 – 10.2.13.33	10.2.13.33
18	10.2.13.34/31	10.2.13.34 – 10.2.13.35	10.2.13.35
19	10.2.13.36/31	10.2.13.36 – 10.2.13.37	10.2.13.37
20	10.2.13.38/31	10.2.13.38 – 10.2.13.39	10.2.13.39
21	10.2.13.40/31	10.2.13.40 – 10.2.13.41	10.2.13.41
22	10.2.13.42/31	10.2.13.42 – 10.2.13.43	10.2.13.43
23	10.2.13.44/31	10.2.13.44 – 10.2.13.45	10.2.13.45
24	10.2.13.46/31	10.2.13.46 – 10.2.13.47	10.2.13.47
25	10.2.13.48/31	10.2.13.48 – 10.2.13.49	10.2.13.49
26	10.2.13.50/31	10.2.13.50 – 10.2.13.51	10.2.13.51
27	10.2.13.52/31	10.2.13.52 – 10.2.13.53	10.2.13.53
28	10.2.13.54/31	10.2.13.54 – 10.2.13.55	10.2.13.55
29	10.2.13.56/31	10.2.13.56 – 10.2.13.57	10.2.13.57
30	10.2.13.58/31	10.2.13.58 – 10.2.13.59	10.2.13.59
31	10.2.13.60/31	10.2.13.60 – 10.2.13.61	10.2.13.61
32	10.2.13.62/31	10.2.13.62 – 10.2.13.63	10.2.13.63
33	10.2.13.64/31	10.2.13.64 – 10.2.13.65	10.2.13.65
34	10.2.13.66/31	10.2.13.66 – 10.2.13.67	10.2.13.67
35	10.2.13.68/31	10.2.13.68 – 10.2.13.69	10.2.13.69
36	10.2.13.70/31	10.2.13.70 – 10.2.13.71	10.2.13.71
37	10.2.13.72/31	10.2.13.72 – 10.2.13.73	10.2.13.73
38	10.2.13.74/31	10.2.13.74 – 10.2.13.75	10.2.13.75
39	10.2.13.76/31	10.2.13.76 – 10.2.13.77	10.2.13.77
40	10.2.13.78/31	10.2.13.78 – 10.2.13.79	10.2.13.79
41	10.2.13.80/31	10.2.13.80 – 10.2.13.81	10.2.13.81
42	10.2.13.82/31	10.2.13.82 – 10.2.13.83	10.2.13.83
43	10.2.13.84/31	10.2.13.84 – 10.2.13.85	10.2.13.85
44	10.2.13.86/31	10.2.13.86 – 10.2.13.87	10.2.13.87
45	10.2.13.88/31	10.2.13.88 – 10.2.13.89	10.2.13.89
46	10.2.13.90/31	10.2.13.90 – 10.2.13.91	10.2.13.91
47	10.2.13.92/31	10.2.13.92 – 10.2.13.93	10.2.13.93
48	10.2.13.94/31	10.2.13.94 – 10.2.13.95	10.2.13.95
49	10.2.13.96/31	10.2.13.96 – 10.2.13.97	10.2.13.97
50	10.2.13.98/31	10.2.13.98 – 10.2.13.99	10.2.13.99
51	10.2.13.100/31	10.2.13.100 – 10.2.13.101	10.2.13.101
52	10.2.13.102/31	10.2.13.102 – 10.2.13.103	10.2.13.103
53	10.2.13.104/31	10.2.13.104 – 10.2.13.105	10.2.13.105
54	10.2.13.106/31	10.2.13.106 – 10.2.13.107	10.2.13.107
55	10.2.13.108/31	10.2.13.108 – 10.2.13.109	10.2.13.109
56	10.2.13.110/31	10.2.13.110 – 10.2.13.111	10.2.13.111
57	10.2.13.112/31	10.2.13.112 – 10.2.13.113	10.2.13.113
58	10.2.13.114/31	10.2.13.114 – 10.2.13.115	10.2.13.115
59	10.2.13.116/31	10.2.13.116 – 10.2.13.117	10.2.13.117
60	10.2.13.118/31	10.2.13.118 – 10.2.13.119	10.2.13.119
61	10.2.13.120/31	10.2.13.120 – 10.2.13.121	10.2.13.121
62	10.2.13.122/31	10.2.13.122 – 10.2.13.123	10.2.13.123
63	10.2.13.124/31	10.2.13.124 – 10.2.13.125	10.2.13.125
64	10.2.13.126/31	10.2.13.126 – 10.2.13.127	10.2.13.127
65	10.2.13.128/31	10.2.13.128 – 10.2.13.129	10.2.13.129
66	10.2.13.130/31	10.2.13.130 – 10.2.13.131	10.2.13.131
67	10.2.13.132/31	10.2.13.132 – 10.2.13.133	10.2.13.133
68	10.2.13.134/31	10.2.13.134 – 10.2.13.135	10.2.13.135
69	10.2.13.136/31	10.2.13.136 – 10.2.13.137	10.2.13.137
70	10.2.13.138/31	10.2.13.138 – 10.2.13.139	10.2.13.139
71	10.2.13.140/31	10.2.13.140 – 10.2.13.141	10.2.13.141
72	10.2.13.142/31	10.2.13.142 – 10.2.13.143	10.2.13.143
73	10.2.13.144/31	10.2.13.144 – 10.2.13.145	10.2.13.145
74	10.2.13.146/31	10.2.13.146 – 10.2.13.147	10.2.13.147
75	10.2.13.148/31	10.2.13.148 – 10.2.13.149	10.2.13.149
76	10.2.13.150/31	10.2.13.150 – 10.2.13.151	10.2.13.151
77	10.2.13.152/31	10.2.13.152 – 10.2.13.153	10.2.13.153
78	10.2.13.154/31	10.2.13.154 – 10.2.13.155	10.2.13.155
79	10.2.13.156/31	10.2.13.156 – 10.2.13.157	10.2.13.157
80	10.2.13.158/31	10.2.13.158 – 10.2.13.159	10.2.13.159
81	10.2.13.160/31	10.2.13.160 – 10.2.13.161	10.2.13.161
82	10.2.13.162/31	10.2.13.162 – 10.2.13.163	10.2.13.163
83	10.2.13.164/31	10.2.13.164 – 10.2.13.165	10.2.13.165
84	10.2.13.166/31	10.2.13.166 – 10.2.13.167	10.2.13.167
85	10.2.13.168/31	10.2.13.168 – 10.2.13.169	10.2.13.169
86	10.2.13.170/31	10.2.13.170 – 10.2.13.171	10.2.13.171
87	10.2.13.172/31	10.2.13.172 – 10.2.13.173	10.2.13.173
88	10.2.13.174/31	10.2.13.174 – 10.2.13.175	10.2.13.175
89	10.2.13.176/31	10.2.13.176 – 10.2.13.177	10.2.13.177
90	10.2.13.178/31	10.2.13.178 – 10.2.13.179	10.2.13.179
91	10.2.13.180/31	10.2.13.180 – 10.2.13.181	10.2.13.181
92	10.2.13.182/31	10.2.13.182 – 10.2.13.183	10.2.13.183
93	10.2.13.184/31	10.2.13.184 – 10.2.13.185	10.2.13.185
94	10.2.13.186/31	10.2.13.186 – 10.2.13.187	10.2.13.187
95	10.2.13.188/31	10.2.13.188 – 10.2.13.189	10.2.13.189
96	10.2.13.190/31	10.2.13.190 – 10.2.13.191	10.2.13.191
97	10.2.13.192/31	10.2.13.192 – 10.2.13.193	10.2.13.193
98	10.2.13.194/31	10.2.13.194 – 10.2.13.195	10.2.13.195
99	10.2.13.196/31	10.2.13.196 – 10.2.13.197	10.2.13.197
100	10.2.13.198/31	10.2.13.198 – 10.2.13.199	10.2.13.199
101	10.2.13.200/31	10.2.13.200 – 10.2.13.201	10.2.13.201
102	10.2.13.202/31	10.2.13.202 – 10.2.13.203	10.2.13.203
103	10.2.13.204/31	10.2.13.204 – 10.2.13.205	10.2.13.205
104	10.2.13.206/31	10.2.13.206 – 10.2.13.207	10.2.13.207
105	10.2.13.208/31	10.2.13.208 – 10.2.13.209	10.2.13.209
106	10.2.13.210/31	10.2.13.210 – 10.2.13.211	10.2.13.211
107	10.2.13.212/31	10.2.13.212 – 10.2.13.213	10.2.13.213
108	10.2.13.214/31	10.2.13.214 – 10.2.13.215	10.2.13.215
109	10.2.13.216/31	10.2.13.216 – 10.2.13.217	10.2.13.217
110	10.2.13.218/31	10.2.13.218 – 10.2.13.219	10.2.13.219
111	10.2.13.220/31	10.2.13.220 – 10.2.13.221	10.2.13.221
112	10.2.13.222/31	10.2.13.222 – 10.2.13.223	10.2.13.223
113	10.2.13.224/31	10.2.13.224 – 10.2.13.225	10.2.13.225
114	10.2.13.226/31	10.2.13.226 – 10.2.13.227	10.2.13.227
115	10.2.13.228/31	10.2.13.228 – 10.2.13.229	10.2.13.229
116	10.2.13.230/31	10.2.13.230 – 10.2.13.231	10.2.13.231
117	10.2.13.232/31	10.2.13.232 – 10.2.13.233	10.2.13.233
118	10.2.13.234/31	10.2.13.234 – 10.2.13.235	10.2.13.235
119	10.2.13.236/31	10.2.13.236 – 10.2.13.237	10.2.13.237
120	10.2.13.238/31	10.2.13.238 – 10.2.13.239	10.2.13.239
121	10.2.13.240/31	10.2.13.240 – 10.2.13.241	10.2.13.241
122	10.2.13.242/31	10.2.13.242 – 10.2.13.243	10.2.13.243
123	10.2.13.244/31	10.2.13.244 – 10.2.13.245	10.2.13.245
124	10.2.13.246/31	10.2.13.246 – 10.2.13.247	10.2.13.247
125	10.2.13.248/31	10.2.13.248 – 10.2.13.249	10.2.13.249
126	10.2.13.250/31	10.2.13.250 – 10.2.13.251	10.2.13.251
127	10.2.13.252/31	10.2.13.252 – 10.2.13.253	10.2.13.253
128	10.2.13.254/31	10.2.13.254 – 10.2.13.255	10.2.13.255

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 →