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)10.72.232.0/23

network10.72.232.0/23

broadcast10.72.233.255

first host10.72.232.1

last host10.72.233.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.72.232.0/23

address00001010.01001000.11101000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01001000.11101000.00000000

broadcast00001010.01001000.11101001.11111111

green = network part, grey = host part

hex0x0a48e800

decimal172550144

reverse dns0.232.72.10.in-addr.arpa

ipv4-mapped::ffff:a48:e800

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.72.232.0/30	10.72.232.1 – 10.72.232.2	10.72.232.3
2	10.72.232.4/30	10.72.232.5 – 10.72.232.6	10.72.232.7
3	10.72.232.8/30	10.72.232.9 – 10.72.232.10	10.72.232.11
4	10.72.232.12/30	10.72.232.13 – 10.72.232.14	10.72.232.15
5	10.72.232.16/30	10.72.232.17 – 10.72.232.18	10.72.232.19
6	10.72.232.20/30	10.72.232.21 – 10.72.232.22	10.72.232.23
7	10.72.232.24/30	10.72.232.25 – 10.72.232.26	10.72.232.27
8	10.72.232.28/30	10.72.232.29 – 10.72.232.30	10.72.232.31
9	10.72.232.32/30	10.72.232.33 – 10.72.232.34	10.72.232.35
10	10.72.232.36/30	10.72.232.37 – 10.72.232.38	10.72.232.39
11	10.72.232.40/30	10.72.232.41 – 10.72.232.42	10.72.232.43
12	10.72.232.44/30	10.72.232.45 – 10.72.232.46	10.72.232.47
13	10.72.232.48/30	10.72.232.49 – 10.72.232.50	10.72.232.51
14	10.72.232.52/30	10.72.232.53 – 10.72.232.54	10.72.232.55
15	10.72.232.56/30	10.72.232.57 – 10.72.232.58	10.72.232.59
16	10.72.232.60/30	10.72.232.61 – 10.72.232.62	10.72.232.63
17	10.72.232.64/30	10.72.232.65 – 10.72.232.66	10.72.232.67
18	10.72.232.68/30	10.72.232.69 – 10.72.232.70	10.72.232.71
19	10.72.232.72/30	10.72.232.73 – 10.72.232.74	10.72.232.75
20	10.72.232.76/30	10.72.232.77 – 10.72.232.78	10.72.232.79
21	10.72.232.80/30	10.72.232.81 – 10.72.232.82	10.72.232.83
22	10.72.232.84/30	10.72.232.85 – 10.72.232.86	10.72.232.87
23	10.72.232.88/30	10.72.232.89 – 10.72.232.90	10.72.232.91
24	10.72.232.92/30	10.72.232.93 – 10.72.232.94	10.72.232.95
25	10.72.232.96/30	10.72.232.97 – 10.72.232.98	10.72.232.99
26	10.72.232.100/30	10.72.232.101 – 10.72.232.102	10.72.232.103
27	10.72.232.104/30	10.72.232.105 – 10.72.232.106	10.72.232.107
28	10.72.232.108/30	10.72.232.109 – 10.72.232.110	10.72.232.111
29	10.72.232.112/30	10.72.232.113 – 10.72.232.114	10.72.232.115
30	10.72.232.116/30	10.72.232.117 – 10.72.232.118	10.72.232.119
31	10.72.232.120/30	10.72.232.121 – 10.72.232.122	10.72.232.123
32	10.72.232.124/30	10.72.232.125 – 10.72.232.126	10.72.232.127
33	10.72.232.128/30	10.72.232.129 – 10.72.232.130	10.72.232.131
34	10.72.232.132/30	10.72.232.133 – 10.72.232.134	10.72.232.135
35	10.72.232.136/30	10.72.232.137 – 10.72.232.138	10.72.232.139
36	10.72.232.140/30	10.72.232.141 – 10.72.232.142	10.72.232.143
37	10.72.232.144/30	10.72.232.145 – 10.72.232.146	10.72.232.147
38	10.72.232.148/30	10.72.232.149 – 10.72.232.150	10.72.232.151
39	10.72.232.152/30	10.72.232.153 – 10.72.232.154	10.72.232.155
40	10.72.232.156/30	10.72.232.157 – 10.72.232.158	10.72.232.159
41	10.72.232.160/30	10.72.232.161 – 10.72.232.162	10.72.232.163
42	10.72.232.164/30	10.72.232.165 – 10.72.232.166	10.72.232.167
43	10.72.232.168/30	10.72.232.169 – 10.72.232.170	10.72.232.171
44	10.72.232.172/30	10.72.232.173 – 10.72.232.174	10.72.232.175
45	10.72.232.176/30	10.72.232.177 – 10.72.232.178	10.72.232.179
46	10.72.232.180/30	10.72.232.181 – 10.72.232.182	10.72.232.183
47	10.72.232.184/30	10.72.232.185 – 10.72.232.186	10.72.232.187
48	10.72.232.188/30	10.72.232.189 – 10.72.232.190	10.72.232.191
49	10.72.232.192/30	10.72.232.193 – 10.72.232.194	10.72.232.195
50	10.72.232.196/30	10.72.232.197 – 10.72.232.198	10.72.232.199
51	10.72.232.200/30	10.72.232.201 – 10.72.232.202	10.72.232.203
52	10.72.232.204/30	10.72.232.205 – 10.72.232.206	10.72.232.207
53	10.72.232.208/30	10.72.232.209 – 10.72.232.210	10.72.232.211
54	10.72.232.212/30	10.72.232.213 – 10.72.232.214	10.72.232.215
55	10.72.232.216/30	10.72.232.217 – 10.72.232.218	10.72.232.219
56	10.72.232.220/30	10.72.232.221 – 10.72.232.222	10.72.232.223
57	10.72.232.224/30	10.72.232.225 – 10.72.232.226	10.72.232.227
58	10.72.232.228/30	10.72.232.229 – 10.72.232.230	10.72.232.231
59	10.72.232.232/30	10.72.232.233 – 10.72.232.234	10.72.232.235
60	10.72.232.236/30	10.72.232.237 – 10.72.232.238	10.72.232.239
61	10.72.232.240/30	10.72.232.241 – 10.72.232.242	10.72.232.243
62	10.72.232.244/30	10.72.232.245 – 10.72.232.246	10.72.232.247
63	10.72.232.248/30	10.72.232.249 – 10.72.232.250	10.72.232.251
64	10.72.232.252/30	10.72.232.253 – 10.72.232.254	10.72.232.255
65	10.72.233.0/30	10.72.233.1 – 10.72.233.2	10.72.233.3
66	10.72.233.4/30	10.72.233.5 – 10.72.233.6	10.72.233.7
67	10.72.233.8/30	10.72.233.9 – 10.72.233.10	10.72.233.11
68	10.72.233.12/30	10.72.233.13 – 10.72.233.14	10.72.233.15
69	10.72.233.16/30	10.72.233.17 – 10.72.233.18	10.72.233.19
70	10.72.233.20/30	10.72.233.21 – 10.72.233.22	10.72.233.23
71	10.72.233.24/30	10.72.233.25 – 10.72.233.26	10.72.233.27
72	10.72.233.28/30	10.72.233.29 – 10.72.233.30	10.72.233.31
73	10.72.233.32/30	10.72.233.33 – 10.72.233.34	10.72.233.35
74	10.72.233.36/30	10.72.233.37 – 10.72.233.38	10.72.233.39
75	10.72.233.40/30	10.72.233.41 – 10.72.233.42	10.72.233.43
76	10.72.233.44/30	10.72.233.45 – 10.72.233.46	10.72.233.47
77	10.72.233.48/30	10.72.233.49 – 10.72.233.50	10.72.233.51
78	10.72.233.52/30	10.72.233.53 – 10.72.233.54	10.72.233.55
79	10.72.233.56/30	10.72.233.57 – 10.72.233.58	10.72.233.59
80	10.72.233.60/30	10.72.233.61 – 10.72.233.62	10.72.233.63
81	10.72.233.64/30	10.72.233.65 – 10.72.233.66	10.72.233.67
82	10.72.233.68/30	10.72.233.69 – 10.72.233.70	10.72.233.71
83	10.72.233.72/30	10.72.233.73 – 10.72.233.74	10.72.233.75
84	10.72.233.76/30	10.72.233.77 – 10.72.233.78	10.72.233.79
85	10.72.233.80/30	10.72.233.81 – 10.72.233.82	10.72.233.83
86	10.72.233.84/30	10.72.233.85 – 10.72.233.86	10.72.233.87
87	10.72.233.88/30	10.72.233.89 – 10.72.233.90	10.72.233.91
88	10.72.233.92/30	10.72.233.93 – 10.72.233.94	10.72.233.95
89	10.72.233.96/30	10.72.233.97 – 10.72.233.98	10.72.233.99
90	10.72.233.100/30	10.72.233.101 – 10.72.233.102	10.72.233.103
91	10.72.233.104/30	10.72.233.105 – 10.72.233.106	10.72.233.107
92	10.72.233.108/30	10.72.233.109 – 10.72.233.110	10.72.233.111
93	10.72.233.112/30	10.72.233.113 – 10.72.233.114	10.72.233.115
94	10.72.233.116/30	10.72.233.117 – 10.72.233.118	10.72.233.119
95	10.72.233.120/30	10.72.233.121 – 10.72.233.122	10.72.233.123
96	10.72.233.124/30	10.72.233.125 – 10.72.233.126	10.72.233.127
97	10.72.233.128/30	10.72.233.129 – 10.72.233.130	10.72.233.131
98	10.72.233.132/30	10.72.233.133 – 10.72.233.134	10.72.233.135
99	10.72.233.136/30	10.72.233.137 – 10.72.233.138	10.72.233.139
100	10.72.233.140/30	10.72.233.141 – 10.72.233.142	10.72.233.143
101	10.72.233.144/30	10.72.233.145 – 10.72.233.146	10.72.233.147
102	10.72.233.148/30	10.72.233.149 – 10.72.233.150	10.72.233.151
103	10.72.233.152/30	10.72.233.153 – 10.72.233.154	10.72.233.155
104	10.72.233.156/30	10.72.233.157 – 10.72.233.158	10.72.233.159
105	10.72.233.160/30	10.72.233.161 – 10.72.233.162	10.72.233.163
106	10.72.233.164/30	10.72.233.165 – 10.72.233.166	10.72.233.167
107	10.72.233.168/30	10.72.233.169 – 10.72.233.170	10.72.233.171
108	10.72.233.172/30	10.72.233.173 – 10.72.233.174	10.72.233.175
109	10.72.233.176/30	10.72.233.177 – 10.72.233.178	10.72.233.179
110	10.72.233.180/30	10.72.233.181 – 10.72.233.182	10.72.233.183
111	10.72.233.184/30	10.72.233.185 – 10.72.233.186	10.72.233.187
112	10.72.233.188/30	10.72.233.189 – 10.72.233.190	10.72.233.191
113	10.72.233.192/30	10.72.233.193 – 10.72.233.194	10.72.233.195
114	10.72.233.196/30	10.72.233.197 – 10.72.233.198	10.72.233.199
115	10.72.233.200/30	10.72.233.201 – 10.72.233.202	10.72.233.203
116	10.72.233.204/30	10.72.233.205 – 10.72.233.206	10.72.233.207
117	10.72.233.208/30	10.72.233.209 – 10.72.233.210	10.72.233.211
118	10.72.233.212/30	10.72.233.213 – 10.72.233.214	10.72.233.215
119	10.72.233.216/30	10.72.233.217 – 10.72.233.218	10.72.233.219
120	10.72.233.220/30	10.72.233.221 – 10.72.233.222	10.72.233.223
121	10.72.233.224/30	10.72.233.225 – 10.72.233.226	10.72.233.227
122	10.72.233.228/30	10.72.233.229 – 10.72.233.230	10.72.233.231
123	10.72.233.232/30	10.72.233.233 – 10.72.233.234	10.72.233.235
124	10.72.233.236/30	10.72.233.237 – 10.72.233.238	10.72.233.239
125	10.72.233.240/30	10.72.233.241 – 10.72.233.242	10.72.233.243
126	10.72.233.244/30	10.72.233.245 – 10.72.233.246	10.72.233.247
127	10.72.233.248/30	10.72.233.249 – 10.72.233.250	10.72.233.251
128	10.72.233.252/30	10.72.233.253 – 10.72.233.254	10.72.233.255

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 →