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)10.8.72.0/23

network10.8.72.0/23

broadcast10.8.73.255

first host10.8.72.1

last host10.8.73.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.8.72.0/23

address00001010.00001000.01001000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00001000.01001000.00000000

broadcast00001010.00001000.01001001.11111111

green = network part, grey = host part

hex0x0a084800

decimal168314880

reverse dns0.72.8.10.in-addr.arpa

ipv4-mapped::ffff:a08:4800

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.8.72.0/30	10.8.72.1 – 10.8.72.2	10.8.72.3
2	10.8.72.4/30	10.8.72.5 – 10.8.72.6	10.8.72.7
3	10.8.72.8/30	10.8.72.9 – 10.8.72.10	10.8.72.11
4	10.8.72.12/30	10.8.72.13 – 10.8.72.14	10.8.72.15
5	10.8.72.16/30	10.8.72.17 – 10.8.72.18	10.8.72.19
6	10.8.72.20/30	10.8.72.21 – 10.8.72.22	10.8.72.23
7	10.8.72.24/30	10.8.72.25 – 10.8.72.26	10.8.72.27
8	10.8.72.28/30	10.8.72.29 – 10.8.72.30	10.8.72.31
9	10.8.72.32/30	10.8.72.33 – 10.8.72.34	10.8.72.35
10	10.8.72.36/30	10.8.72.37 – 10.8.72.38	10.8.72.39
11	10.8.72.40/30	10.8.72.41 – 10.8.72.42	10.8.72.43
12	10.8.72.44/30	10.8.72.45 – 10.8.72.46	10.8.72.47
13	10.8.72.48/30	10.8.72.49 – 10.8.72.50	10.8.72.51
14	10.8.72.52/30	10.8.72.53 – 10.8.72.54	10.8.72.55
15	10.8.72.56/30	10.8.72.57 – 10.8.72.58	10.8.72.59
16	10.8.72.60/30	10.8.72.61 – 10.8.72.62	10.8.72.63
17	10.8.72.64/30	10.8.72.65 – 10.8.72.66	10.8.72.67
18	10.8.72.68/30	10.8.72.69 – 10.8.72.70	10.8.72.71
19	10.8.72.72/30	10.8.72.73 – 10.8.72.74	10.8.72.75
20	10.8.72.76/30	10.8.72.77 – 10.8.72.78	10.8.72.79
21	10.8.72.80/30	10.8.72.81 – 10.8.72.82	10.8.72.83
22	10.8.72.84/30	10.8.72.85 – 10.8.72.86	10.8.72.87
23	10.8.72.88/30	10.8.72.89 – 10.8.72.90	10.8.72.91
24	10.8.72.92/30	10.8.72.93 – 10.8.72.94	10.8.72.95
25	10.8.72.96/30	10.8.72.97 – 10.8.72.98	10.8.72.99
26	10.8.72.100/30	10.8.72.101 – 10.8.72.102	10.8.72.103
27	10.8.72.104/30	10.8.72.105 – 10.8.72.106	10.8.72.107
28	10.8.72.108/30	10.8.72.109 – 10.8.72.110	10.8.72.111
29	10.8.72.112/30	10.8.72.113 – 10.8.72.114	10.8.72.115
30	10.8.72.116/30	10.8.72.117 – 10.8.72.118	10.8.72.119
31	10.8.72.120/30	10.8.72.121 – 10.8.72.122	10.8.72.123
32	10.8.72.124/30	10.8.72.125 – 10.8.72.126	10.8.72.127
33	10.8.72.128/30	10.8.72.129 – 10.8.72.130	10.8.72.131
34	10.8.72.132/30	10.8.72.133 – 10.8.72.134	10.8.72.135
35	10.8.72.136/30	10.8.72.137 – 10.8.72.138	10.8.72.139
36	10.8.72.140/30	10.8.72.141 – 10.8.72.142	10.8.72.143
37	10.8.72.144/30	10.8.72.145 – 10.8.72.146	10.8.72.147
38	10.8.72.148/30	10.8.72.149 – 10.8.72.150	10.8.72.151
39	10.8.72.152/30	10.8.72.153 – 10.8.72.154	10.8.72.155
40	10.8.72.156/30	10.8.72.157 – 10.8.72.158	10.8.72.159
41	10.8.72.160/30	10.8.72.161 – 10.8.72.162	10.8.72.163
42	10.8.72.164/30	10.8.72.165 – 10.8.72.166	10.8.72.167
43	10.8.72.168/30	10.8.72.169 – 10.8.72.170	10.8.72.171
44	10.8.72.172/30	10.8.72.173 – 10.8.72.174	10.8.72.175
45	10.8.72.176/30	10.8.72.177 – 10.8.72.178	10.8.72.179
46	10.8.72.180/30	10.8.72.181 – 10.8.72.182	10.8.72.183
47	10.8.72.184/30	10.8.72.185 – 10.8.72.186	10.8.72.187
48	10.8.72.188/30	10.8.72.189 – 10.8.72.190	10.8.72.191
49	10.8.72.192/30	10.8.72.193 – 10.8.72.194	10.8.72.195
50	10.8.72.196/30	10.8.72.197 – 10.8.72.198	10.8.72.199
51	10.8.72.200/30	10.8.72.201 – 10.8.72.202	10.8.72.203
52	10.8.72.204/30	10.8.72.205 – 10.8.72.206	10.8.72.207
53	10.8.72.208/30	10.8.72.209 – 10.8.72.210	10.8.72.211
54	10.8.72.212/30	10.8.72.213 – 10.8.72.214	10.8.72.215
55	10.8.72.216/30	10.8.72.217 – 10.8.72.218	10.8.72.219
56	10.8.72.220/30	10.8.72.221 – 10.8.72.222	10.8.72.223
57	10.8.72.224/30	10.8.72.225 – 10.8.72.226	10.8.72.227
58	10.8.72.228/30	10.8.72.229 – 10.8.72.230	10.8.72.231
59	10.8.72.232/30	10.8.72.233 – 10.8.72.234	10.8.72.235
60	10.8.72.236/30	10.8.72.237 – 10.8.72.238	10.8.72.239
61	10.8.72.240/30	10.8.72.241 – 10.8.72.242	10.8.72.243
62	10.8.72.244/30	10.8.72.245 – 10.8.72.246	10.8.72.247
63	10.8.72.248/30	10.8.72.249 – 10.8.72.250	10.8.72.251
64	10.8.72.252/30	10.8.72.253 – 10.8.72.254	10.8.72.255
65	10.8.73.0/30	10.8.73.1 – 10.8.73.2	10.8.73.3
66	10.8.73.4/30	10.8.73.5 – 10.8.73.6	10.8.73.7
67	10.8.73.8/30	10.8.73.9 – 10.8.73.10	10.8.73.11
68	10.8.73.12/30	10.8.73.13 – 10.8.73.14	10.8.73.15
69	10.8.73.16/30	10.8.73.17 – 10.8.73.18	10.8.73.19
70	10.8.73.20/30	10.8.73.21 – 10.8.73.22	10.8.73.23
71	10.8.73.24/30	10.8.73.25 – 10.8.73.26	10.8.73.27
72	10.8.73.28/30	10.8.73.29 – 10.8.73.30	10.8.73.31
73	10.8.73.32/30	10.8.73.33 – 10.8.73.34	10.8.73.35
74	10.8.73.36/30	10.8.73.37 – 10.8.73.38	10.8.73.39
75	10.8.73.40/30	10.8.73.41 – 10.8.73.42	10.8.73.43
76	10.8.73.44/30	10.8.73.45 – 10.8.73.46	10.8.73.47
77	10.8.73.48/30	10.8.73.49 – 10.8.73.50	10.8.73.51
78	10.8.73.52/30	10.8.73.53 – 10.8.73.54	10.8.73.55
79	10.8.73.56/30	10.8.73.57 – 10.8.73.58	10.8.73.59
80	10.8.73.60/30	10.8.73.61 – 10.8.73.62	10.8.73.63
81	10.8.73.64/30	10.8.73.65 – 10.8.73.66	10.8.73.67
82	10.8.73.68/30	10.8.73.69 – 10.8.73.70	10.8.73.71
83	10.8.73.72/30	10.8.73.73 – 10.8.73.74	10.8.73.75
84	10.8.73.76/30	10.8.73.77 – 10.8.73.78	10.8.73.79
85	10.8.73.80/30	10.8.73.81 – 10.8.73.82	10.8.73.83
86	10.8.73.84/30	10.8.73.85 – 10.8.73.86	10.8.73.87
87	10.8.73.88/30	10.8.73.89 – 10.8.73.90	10.8.73.91
88	10.8.73.92/30	10.8.73.93 – 10.8.73.94	10.8.73.95
89	10.8.73.96/30	10.8.73.97 – 10.8.73.98	10.8.73.99
90	10.8.73.100/30	10.8.73.101 – 10.8.73.102	10.8.73.103
91	10.8.73.104/30	10.8.73.105 – 10.8.73.106	10.8.73.107
92	10.8.73.108/30	10.8.73.109 – 10.8.73.110	10.8.73.111
93	10.8.73.112/30	10.8.73.113 – 10.8.73.114	10.8.73.115
94	10.8.73.116/30	10.8.73.117 – 10.8.73.118	10.8.73.119
95	10.8.73.120/30	10.8.73.121 – 10.8.73.122	10.8.73.123
96	10.8.73.124/30	10.8.73.125 – 10.8.73.126	10.8.73.127
97	10.8.73.128/30	10.8.73.129 – 10.8.73.130	10.8.73.131
98	10.8.73.132/30	10.8.73.133 – 10.8.73.134	10.8.73.135
99	10.8.73.136/30	10.8.73.137 – 10.8.73.138	10.8.73.139
100	10.8.73.140/30	10.8.73.141 – 10.8.73.142	10.8.73.143
101	10.8.73.144/30	10.8.73.145 – 10.8.73.146	10.8.73.147
102	10.8.73.148/30	10.8.73.149 – 10.8.73.150	10.8.73.151
103	10.8.73.152/30	10.8.73.153 – 10.8.73.154	10.8.73.155
104	10.8.73.156/30	10.8.73.157 – 10.8.73.158	10.8.73.159
105	10.8.73.160/30	10.8.73.161 – 10.8.73.162	10.8.73.163
106	10.8.73.164/30	10.8.73.165 – 10.8.73.166	10.8.73.167
107	10.8.73.168/30	10.8.73.169 – 10.8.73.170	10.8.73.171
108	10.8.73.172/30	10.8.73.173 – 10.8.73.174	10.8.73.175
109	10.8.73.176/30	10.8.73.177 – 10.8.73.178	10.8.73.179
110	10.8.73.180/30	10.8.73.181 – 10.8.73.182	10.8.73.183
111	10.8.73.184/30	10.8.73.185 – 10.8.73.186	10.8.73.187
112	10.8.73.188/30	10.8.73.189 – 10.8.73.190	10.8.73.191
113	10.8.73.192/30	10.8.73.193 – 10.8.73.194	10.8.73.195
114	10.8.73.196/30	10.8.73.197 – 10.8.73.198	10.8.73.199
115	10.8.73.200/30	10.8.73.201 – 10.8.73.202	10.8.73.203
116	10.8.73.204/30	10.8.73.205 – 10.8.73.206	10.8.73.207
117	10.8.73.208/30	10.8.73.209 – 10.8.73.210	10.8.73.211
118	10.8.73.212/30	10.8.73.213 – 10.8.73.214	10.8.73.215
119	10.8.73.216/30	10.8.73.217 – 10.8.73.218	10.8.73.219
120	10.8.73.220/30	10.8.73.221 – 10.8.73.222	10.8.73.223
121	10.8.73.224/30	10.8.73.225 – 10.8.73.226	10.8.73.227
122	10.8.73.228/30	10.8.73.229 – 10.8.73.230	10.8.73.231
123	10.8.73.232/30	10.8.73.233 – 10.8.73.234	10.8.73.235
124	10.8.73.236/30	10.8.73.237 – 10.8.73.238	10.8.73.239
125	10.8.73.240/30	10.8.73.241 – 10.8.73.242	10.8.73.243
126	10.8.73.244/30	10.8.73.245 – 10.8.73.246	10.8.73.247
127	10.8.73.248/30	10.8.73.249 – 10.8.73.250	10.8.73.251
128	10.8.73.252/30	10.8.73.253 – 10.8.73.254	10.8.73.255

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 /23
/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	1
/24	255.255.255.0	256	254	2 split →
/25	255.255.255.128	128	126	4 split →
/26	255.255.255.192	64	62	8 split →
/27	255.255.255.224	32	30	16 split →
/28	255.255.255.240	16	14	32 split →
/29	255.255.255.248	8	6	64 split →
/30	255.255.255.252	4	2	128 split →
/31	255.255.255.254	2	2	256 split →
/32	255.255.255.255	1	1	512 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 →