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)10.2.172.0/24

network10.2.172.0/24

broadcast10.2.172.255

first host10.2.172.1

last host10.2.172.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.172.0/24

address00001010.00000010.10101100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10101100.00000000

broadcast00001010.00000010.10101100.11111111

green = network part, grey = host part

hex0x0a02ac00

decimal167947264

reverse dns0.172.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:ac00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.172.0/31	10.2.172.0 – 10.2.172.1	10.2.172.1
2	10.2.172.2/31	10.2.172.2 – 10.2.172.3	10.2.172.3
3	10.2.172.4/31	10.2.172.4 – 10.2.172.5	10.2.172.5
4	10.2.172.6/31	10.2.172.6 – 10.2.172.7	10.2.172.7
5	10.2.172.8/31	10.2.172.8 – 10.2.172.9	10.2.172.9
6	10.2.172.10/31	10.2.172.10 – 10.2.172.11	10.2.172.11
7	10.2.172.12/31	10.2.172.12 – 10.2.172.13	10.2.172.13
8	10.2.172.14/31	10.2.172.14 – 10.2.172.15	10.2.172.15
9	10.2.172.16/31	10.2.172.16 – 10.2.172.17	10.2.172.17
10	10.2.172.18/31	10.2.172.18 – 10.2.172.19	10.2.172.19
11	10.2.172.20/31	10.2.172.20 – 10.2.172.21	10.2.172.21
12	10.2.172.22/31	10.2.172.22 – 10.2.172.23	10.2.172.23
13	10.2.172.24/31	10.2.172.24 – 10.2.172.25	10.2.172.25
14	10.2.172.26/31	10.2.172.26 – 10.2.172.27	10.2.172.27
15	10.2.172.28/31	10.2.172.28 – 10.2.172.29	10.2.172.29
16	10.2.172.30/31	10.2.172.30 – 10.2.172.31	10.2.172.31
17	10.2.172.32/31	10.2.172.32 – 10.2.172.33	10.2.172.33
18	10.2.172.34/31	10.2.172.34 – 10.2.172.35	10.2.172.35
19	10.2.172.36/31	10.2.172.36 – 10.2.172.37	10.2.172.37
20	10.2.172.38/31	10.2.172.38 – 10.2.172.39	10.2.172.39
21	10.2.172.40/31	10.2.172.40 – 10.2.172.41	10.2.172.41
22	10.2.172.42/31	10.2.172.42 – 10.2.172.43	10.2.172.43
23	10.2.172.44/31	10.2.172.44 – 10.2.172.45	10.2.172.45
24	10.2.172.46/31	10.2.172.46 – 10.2.172.47	10.2.172.47
25	10.2.172.48/31	10.2.172.48 – 10.2.172.49	10.2.172.49
26	10.2.172.50/31	10.2.172.50 – 10.2.172.51	10.2.172.51
27	10.2.172.52/31	10.2.172.52 – 10.2.172.53	10.2.172.53
28	10.2.172.54/31	10.2.172.54 – 10.2.172.55	10.2.172.55
29	10.2.172.56/31	10.2.172.56 – 10.2.172.57	10.2.172.57
30	10.2.172.58/31	10.2.172.58 – 10.2.172.59	10.2.172.59
31	10.2.172.60/31	10.2.172.60 – 10.2.172.61	10.2.172.61
32	10.2.172.62/31	10.2.172.62 – 10.2.172.63	10.2.172.63
33	10.2.172.64/31	10.2.172.64 – 10.2.172.65	10.2.172.65
34	10.2.172.66/31	10.2.172.66 – 10.2.172.67	10.2.172.67
35	10.2.172.68/31	10.2.172.68 – 10.2.172.69	10.2.172.69
36	10.2.172.70/31	10.2.172.70 – 10.2.172.71	10.2.172.71
37	10.2.172.72/31	10.2.172.72 – 10.2.172.73	10.2.172.73
38	10.2.172.74/31	10.2.172.74 – 10.2.172.75	10.2.172.75
39	10.2.172.76/31	10.2.172.76 – 10.2.172.77	10.2.172.77
40	10.2.172.78/31	10.2.172.78 – 10.2.172.79	10.2.172.79
41	10.2.172.80/31	10.2.172.80 – 10.2.172.81	10.2.172.81
42	10.2.172.82/31	10.2.172.82 – 10.2.172.83	10.2.172.83
43	10.2.172.84/31	10.2.172.84 – 10.2.172.85	10.2.172.85
44	10.2.172.86/31	10.2.172.86 – 10.2.172.87	10.2.172.87
45	10.2.172.88/31	10.2.172.88 – 10.2.172.89	10.2.172.89
46	10.2.172.90/31	10.2.172.90 – 10.2.172.91	10.2.172.91
47	10.2.172.92/31	10.2.172.92 – 10.2.172.93	10.2.172.93
48	10.2.172.94/31	10.2.172.94 – 10.2.172.95	10.2.172.95
49	10.2.172.96/31	10.2.172.96 – 10.2.172.97	10.2.172.97
50	10.2.172.98/31	10.2.172.98 – 10.2.172.99	10.2.172.99
51	10.2.172.100/31	10.2.172.100 – 10.2.172.101	10.2.172.101
52	10.2.172.102/31	10.2.172.102 – 10.2.172.103	10.2.172.103
53	10.2.172.104/31	10.2.172.104 – 10.2.172.105	10.2.172.105
54	10.2.172.106/31	10.2.172.106 – 10.2.172.107	10.2.172.107
55	10.2.172.108/31	10.2.172.108 – 10.2.172.109	10.2.172.109
56	10.2.172.110/31	10.2.172.110 – 10.2.172.111	10.2.172.111
57	10.2.172.112/31	10.2.172.112 – 10.2.172.113	10.2.172.113
58	10.2.172.114/31	10.2.172.114 – 10.2.172.115	10.2.172.115
59	10.2.172.116/31	10.2.172.116 – 10.2.172.117	10.2.172.117
60	10.2.172.118/31	10.2.172.118 – 10.2.172.119	10.2.172.119
61	10.2.172.120/31	10.2.172.120 – 10.2.172.121	10.2.172.121
62	10.2.172.122/31	10.2.172.122 – 10.2.172.123	10.2.172.123
63	10.2.172.124/31	10.2.172.124 – 10.2.172.125	10.2.172.125
64	10.2.172.126/31	10.2.172.126 – 10.2.172.127	10.2.172.127
65	10.2.172.128/31	10.2.172.128 – 10.2.172.129	10.2.172.129
66	10.2.172.130/31	10.2.172.130 – 10.2.172.131	10.2.172.131
67	10.2.172.132/31	10.2.172.132 – 10.2.172.133	10.2.172.133
68	10.2.172.134/31	10.2.172.134 – 10.2.172.135	10.2.172.135
69	10.2.172.136/31	10.2.172.136 – 10.2.172.137	10.2.172.137
70	10.2.172.138/31	10.2.172.138 – 10.2.172.139	10.2.172.139
71	10.2.172.140/31	10.2.172.140 – 10.2.172.141	10.2.172.141
72	10.2.172.142/31	10.2.172.142 – 10.2.172.143	10.2.172.143
73	10.2.172.144/31	10.2.172.144 – 10.2.172.145	10.2.172.145
74	10.2.172.146/31	10.2.172.146 – 10.2.172.147	10.2.172.147
75	10.2.172.148/31	10.2.172.148 – 10.2.172.149	10.2.172.149
76	10.2.172.150/31	10.2.172.150 – 10.2.172.151	10.2.172.151
77	10.2.172.152/31	10.2.172.152 – 10.2.172.153	10.2.172.153
78	10.2.172.154/31	10.2.172.154 – 10.2.172.155	10.2.172.155
79	10.2.172.156/31	10.2.172.156 – 10.2.172.157	10.2.172.157
80	10.2.172.158/31	10.2.172.158 – 10.2.172.159	10.2.172.159
81	10.2.172.160/31	10.2.172.160 – 10.2.172.161	10.2.172.161
82	10.2.172.162/31	10.2.172.162 – 10.2.172.163	10.2.172.163
83	10.2.172.164/31	10.2.172.164 – 10.2.172.165	10.2.172.165
84	10.2.172.166/31	10.2.172.166 – 10.2.172.167	10.2.172.167
85	10.2.172.168/31	10.2.172.168 – 10.2.172.169	10.2.172.169
86	10.2.172.170/31	10.2.172.170 – 10.2.172.171	10.2.172.171
87	10.2.172.172/31	10.2.172.172 – 10.2.172.173	10.2.172.173
88	10.2.172.174/31	10.2.172.174 – 10.2.172.175	10.2.172.175
89	10.2.172.176/31	10.2.172.176 – 10.2.172.177	10.2.172.177
90	10.2.172.178/31	10.2.172.178 – 10.2.172.179	10.2.172.179
91	10.2.172.180/31	10.2.172.180 – 10.2.172.181	10.2.172.181
92	10.2.172.182/31	10.2.172.182 – 10.2.172.183	10.2.172.183
93	10.2.172.184/31	10.2.172.184 – 10.2.172.185	10.2.172.185
94	10.2.172.186/31	10.2.172.186 – 10.2.172.187	10.2.172.187
95	10.2.172.188/31	10.2.172.188 – 10.2.172.189	10.2.172.189
96	10.2.172.190/31	10.2.172.190 – 10.2.172.191	10.2.172.191
97	10.2.172.192/31	10.2.172.192 – 10.2.172.193	10.2.172.193
98	10.2.172.194/31	10.2.172.194 – 10.2.172.195	10.2.172.195
99	10.2.172.196/31	10.2.172.196 – 10.2.172.197	10.2.172.197
100	10.2.172.198/31	10.2.172.198 – 10.2.172.199	10.2.172.199
101	10.2.172.200/31	10.2.172.200 – 10.2.172.201	10.2.172.201
102	10.2.172.202/31	10.2.172.202 – 10.2.172.203	10.2.172.203
103	10.2.172.204/31	10.2.172.204 – 10.2.172.205	10.2.172.205
104	10.2.172.206/31	10.2.172.206 – 10.2.172.207	10.2.172.207
105	10.2.172.208/31	10.2.172.208 – 10.2.172.209	10.2.172.209
106	10.2.172.210/31	10.2.172.210 – 10.2.172.211	10.2.172.211
107	10.2.172.212/31	10.2.172.212 – 10.2.172.213	10.2.172.213
108	10.2.172.214/31	10.2.172.214 – 10.2.172.215	10.2.172.215
109	10.2.172.216/31	10.2.172.216 – 10.2.172.217	10.2.172.217
110	10.2.172.218/31	10.2.172.218 – 10.2.172.219	10.2.172.219
111	10.2.172.220/31	10.2.172.220 – 10.2.172.221	10.2.172.221
112	10.2.172.222/31	10.2.172.222 – 10.2.172.223	10.2.172.223
113	10.2.172.224/31	10.2.172.224 – 10.2.172.225	10.2.172.225
114	10.2.172.226/31	10.2.172.226 – 10.2.172.227	10.2.172.227
115	10.2.172.228/31	10.2.172.228 – 10.2.172.229	10.2.172.229
116	10.2.172.230/31	10.2.172.230 – 10.2.172.231	10.2.172.231
117	10.2.172.232/31	10.2.172.232 – 10.2.172.233	10.2.172.233
118	10.2.172.234/31	10.2.172.234 – 10.2.172.235	10.2.172.235
119	10.2.172.236/31	10.2.172.236 – 10.2.172.237	10.2.172.237
120	10.2.172.238/31	10.2.172.238 – 10.2.172.239	10.2.172.239
121	10.2.172.240/31	10.2.172.240 – 10.2.172.241	10.2.172.241
122	10.2.172.242/31	10.2.172.242 – 10.2.172.243	10.2.172.243
123	10.2.172.244/31	10.2.172.244 – 10.2.172.245	10.2.172.245
124	10.2.172.246/31	10.2.172.246 – 10.2.172.247	10.2.172.247
125	10.2.172.248/31	10.2.172.248 – 10.2.172.249	10.2.172.249
126	10.2.172.250/31	10.2.172.250 – 10.2.172.251	10.2.172.251
127	10.2.172.252/31	10.2.172.252 – 10.2.172.253	10.2.172.253
128	10.2.172.254/31	10.2.172.254 – 10.2.172.255	10.2.172.255

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 →