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)10.31.232.0/23

network10.31.232.0/23

broadcast10.31.233.255

first host10.31.232.1

last host10.31.233.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.31.232.0/23

address00001010.00011111.11101000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00011111.11101000.00000000

broadcast00001010.00011111.11101001.11111111

green = network part, grey = host part

hex0x0a1fe800

decimal169863168

reverse dns0.232.31.10.in-addr.arpa

ipv4-mapped::ffff:a1f:e800

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.31.232.0/30	10.31.232.1 – 10.31.232.2	10.31.232.3
2	10.31.232.4/30	10.31.232.5 – 10.31.232.6	10.31.232.7
3	10.31.232.8/30	10.31.232.9 – 10.31.232.10	10.31.232.11
4	10.31.232.12/30	10.31.232.13 – 10.31.232.14	10.31.232.15
5	10.31.232.16/30	10.31.232.17 – 10.31.232.18	10.31.232.19
6	10.31.232.20/30	10.31.232.21 – 10.31.232.22	10.31.232.23
7	10.31.232.24/30	10.31.232.25 – 10.31.232.26	10.31.232.27
8	10.31.232.28/30	10.31.232.29 – 10.31.232.30	10.31.232.31
9	10.31.232.32/30	10.31.232.33 – 10.31.232.34	10.31.232.35
10	10.31.232.36/30	10.31.232.37 – 10.31.232.38	10.31.232.39
11	10.31.232.40/30	10.31.232.41 – 10.31.232.42	10.31.232.43
12	10.31.232.44/30	10.31.232.45 – 10.31.232.46	10.31.232.47
13	10.31.232.48/30	10.31.232.49 – 10.31.232.50	10.31.232.51
14	10.31.232.52/30	10.31.232.53 – 10.31.232.54	10.31.232.55
15	10.31.232.56/30	10.31.232.57 – 10.31.232.58	10.31.232.59
16	10.31.232.60/30	10.31.232.61 – 10.31.232.62	10.31.232.63
17	10.31.232.64/30	10.31.232.65 – 10.31.232.66	10.31.232.67
18	10.31.232.68/30	10.31.232.69 – 10.31.232.70	10.31.232.71
19	10.31.232.72/30	10.31.232.73 – 10.31.232.74	10.31.232.75
20	10.31.232.76/30	10.31.232.77 – 10.31.232.78	10.31.232.79
21	10.31.232.80/30	10.31.232.81 – 10.31.232.82	10.31.232.83
22	10.31.232.84/30	10.31.232.85 – 10.31.232.86	10.31.232.87
23	10.31.232.88/30	10.31.232.89 – 10.31.232.90	10.31.232.91
24	10.31.232.92/30	10.31.232.93 – 10.31.232.94	10.31.232.95
25	10.31.232.96/30	10.31.232.97 – 10.31.232.98	10.31.232.99
26	10.31.232.100/30	10.31.232.101 – 10.31.232.102	10.31.232.103
27	10.31.232.104/30	10.31.232.105 – 10.31.232.106	10.31.232.107
28	10.31.232.108/30	10.31.232.109 – 10.31.232.110	10.31.232.111
29	10.31.232.112/30	10.31.232.113 – 10.31.232.114	10.31.232.115
30	10.31.232.116/30	10.31.232.117 – 10.31.232.118	10.31.232.119
31	10.31.232.120/30	10.31.232.121 – 10.31.232.122	10.31.232.123
32	10.31.232.124/30	10.31.232.125 – 10.31.232.126	10.31.232.127
33	10.31.232.128/30	10.31.232.129 – 10.31.232.130	10.31.232.131
34	10.31.232.132/30	10.31.232.133 – 10.31.232.134	10.31.232.135
35	10.31.232.136/30	10.31.232.137 – 10.31.232.138	10.31.232.139
36	10.31.232.140/30	10.31.232.141 – 10.31.232.142	10.31.232.143
37	10.31.232.144/30	10.31.232.145 – 10.31.232.146	10.31.232.147
38	10.31.232.148/30	10.31.232.149 – 10.31.232.150	10.31.232.151
39	10.31.232.152/30	10.31.232.153 – 10.31.232.154	10.31.232.155
40	10.31.232.156/30	10.31.232.157 – 10.31.232.158	10.31.232.159
41	10.31.232.160/30	10.31.232.161 – 10.31.232.162	10.31.232.163
42	10.31.232.164/30	10.31.232.165 – 10.31.232.166	10.31.232.167
43	10.31.232.168/30	10.31.232.169 – 10.31.232.170	10.31.232.171
44	10.31.232.172/30	10.31.232.173 – 10.31.232.174	10.31.232.175
45	10.31.232.176/30	10.31.232.177 – 10.31.232.178	10.31.232.179
46	10.31.232.180/30	10.31.232.181 – 10.31.232.182	10.31.232.183
47	10.31.232.184/30	10.31.232.185 – 10.31.232.186	10.31.232.187
48	10.31.232.188/30	10.31.232.189 – 10.31.232.190	10.31.232.191
49	10.31.232.192/30	10.31.232.193 – 10.31.232.194	10.31.232.195
50	10.31.232.196/30	10.31.232.197 – 10.31.232.198	10.31.232.199
51	10.31.232.200/30	10.31.232.201 – 10.31.232.202	10.31.232.203
52	10.31.232.204/30	10.31.232.205 – 10.31.232.206	10.31.232.207
53	10.31.232.208/30	10.31.232.209 – 10.31.232.210	10.31.232.211
54	10.31.232.212/30	10.31.232.213 – 10.31.232.214	10.31.232.215
55	10.31.232.216/30	10.31.232.217 – 10.31.232.218	10.31.232.219
56	10.31.232.220/30	10.31.232.221 – 10.31.232.222	10.31.232.223
57	10.31.232.224/30	10.31.232.225 – 10.31.232.226	10.31.232.227
58	10.31.232.228/30	10.31.232.229 – 10.31.232.230	10.31.232.231
59	10.31.232.232/30	10.31.232.233 – 10.31.232.234	10.31.232.235
60	10.31.232.236/30	10.31.232.237 – 10.31.232.238	10.31.232.239
61	10.31.232.240/30	10.31.232.241 – 10.31.232.242	10.31.232.243
62	10.31.232.244/30	10.31.232.245 – 10.31.232.246	10.31.232.247
63	10.31.232.248/30	10.31.232.249 – 10.31.232.250	10.31.232.251
64	10.31.232.252/30	10.31.232.253 – 10.31.232.254	10.31.232.255
65	10.31.233.0/30	10.31.233.1 – 10.31.233.2	10.31.233.3
66	10.31.233.4/30	10.31.233.5 – 10.31.233.6	10.31.233.7
67	10.31.233.8/30	10.31.233.9 – 10.31.233.10	10.31.233.11
68	10.31.233.12/30	10.31.233.13 – 10.31.233.14	10.31.233.15
69	10.31.233.16/30	10.31.233.17 – 10.31.233.18	10.31.233.19
70	10.31.233.20/30	10.31.233.21 – 10.31.233.22	10.31.233.23
71	10.31.233.24/30	10.31.233.25 – 10.31.233.26	10.31.233.27
72	10.31.233.28/30	10.31.233.29 – 10.31.233.30	10.31.233.31
73	10.31.233.32/30	10.31.233.33 – 10.31.233.34	10.31.233.35
74	10.31.233.36/30	10.31.233.37 – 10.31.233.38	10.31.233.39
75	10.31.233.40/30	10.31.233.41 – 10.31.233.42	10.31.233.43
76	10.31.233.44/30	10.31.233.45 – 10.31.233.46	10.31.233.47
77	10.31.233.48/30	10.31.233.49 – 10.31.233.50	10.31.233.51
78	10.31.233.52/30	10.31.233.53 – 10.31.233.54	10.31.233.55
79	10.31.233.56/30	10.31.233.57 – 10.31.233.58	10.31.233.59
80	10.31.233.60/30	10.31.233.61 – 10.31.233.62	10.31.233.63
81	10.31.233.64/30	10.31.233.65 – 10.31.233.66	10.31.233.67
82	10.31.233.68/30	10.31.233.69 – 10.31.233.70	10.31.233.71
83	10.31.233.72/30	10.31.233.73 – 10.31.233.74	10.31.233.75
84	10.31.233.76/30	10.31.233.77 – 10.31.233.78	10.31.233.79
85	10.31.233.80/30	10.31.233.81 – 10.31.233.82	10.31.233.83
86	10.31.233.84/30	10.31.233.85 – 10.31.233.86	10.31.233.87
87	10.31.233.88/30	10.31.233.89 – 10.31.233.90	10.31.233.91
88	10.31.233.92/30	10.31.233.93 – 10.31.233.94	10.31.233.95
89	10.31.233.96/30	10.31.233.97 – 10.31.233.98	10.31.233.99
90	10.31.233.100/30	10.31.233.101 – 10.31.233.102	10.31.233.103
91	10.31.233.104/30	10.31.233.105 – 10.31.233.106	10.31.233.107
92	10.31.233.108/30	10.31.233.109 – 10.31.233.110	10.31.233.111
93	10.31.233.112/30	10.31.233.113 – 10.31.233.114	10.31.233.115
94	10.31.233.116/30	10.31.233.117 – 10.31.233.118	10.31.233.119
95	10.31.233.120/30	10.31.233.121 – 10.31.233.122	10.31.233.123
96	10.31.233.124/30	10.31.233.125 – 10.31.233.126	10.31.233.127
97	10.31.233.128/30	10.31.233.129 – 10.31.233.130	10.31.233.131
98	10.31.233.132/30	10.31.233.133 – 10.31.233.134	10.31.233.135
99	10.31.233.136/30	10.31.233.137 – 10.31.233.138	10.31.233.139
100	10.31.233.140/30	10.31.233.141 – 10.31.233.142	10.31.233.143
101	10.31.233.144/30	10.31.233.145 – 10.31.233.146	10.31.233.147
102	10.31.233.148/30	10.31.233.149 – 10.31.233.150	10.31.233.151
103	10.31.233.152/30	10.31.233.153 – 10.31.233.154	10.31.233.155
104	10.31.233.156/30	10.31.233.157 – 10.31.233.158	10.31.233.159
105	10.31.233.160/30	10.31.233.161 – 10.31.233.162	10.31.233.163
106	10.31.233.164/30	10.31.233.165 – 10.31.233.166	10.31.233.167
107	10.31.233.168/30	10.31.233.169 – 10.31.233.170	10.31.233.171
108	10.31.233.172/30	10.31.233.173 – 10.31.233.174	10.31.233.175
109	10.31.233.176/30	10.31.233.177 – 10.31.233.178	10.31.233.179
110	10.31.233.180/30	10.31.233.181 – 10.31.233.182	10.31.233.183
111	10.31.233.184/30	10.31.233.185 – 10.31.233.186	10.31.233.187
112	10.31.233.188/30	10.31.233.189 – 10.31.233.190	10.31.233.191
113	10.31.233.192/30	10.31.233.193 – 10.31.233.194	10.31.233.195
114	10.31.233.196/30	10.31.233.197 – 10.31.233.198	10.31.233.199
115	10.31.233.200/30	10.31.233.201 – 10.31.233.202	10.31.233.203
116	10.31.233.204/30	10.31.233.205 – 10.31.233.206	10.31.233.207
117	10.31.233.208/30	10.31.233.209 – 10.31.233.210	10.31.233.211
118	10.31.233.212/30	10.31.233.213 – 10.31.233.214	10.31.233.215
119	10.31.233.216/30	10.31.233.217 – 10.31.233.218	10.31.233.219
120	10.31.233.220/30	10.31.233.221 – 10.31.233.222	10.31.233.223
121	10.31.233.224/30	10.31.233.225 – 10.31.233.226	10.31.233.227
122	10.31.233.228/30	10.31.233.229 – 10.31.233.230	10.31.233.231
123	10.31.233.232/30	10.31.233.233 – 10.31.233.234	10.31.233.235
124	10.31.233.236/30	10.31.233.237 – 10.31.233.238	10.31.233.239
125	10.31.233.240/30	10.31.233.241 – 10.31.233.242	10.31.233.243
126	10.31.233.244/30	10.31.233.245 – 10.31.233.246	10.31.233.247
127	10.31.233.248/30	10.31.233.249 – 10.31.233.250	10.31.233.251
128	10.31.233.252/30	10.31.233.253 – 10.31.233.254	10.31.233.255

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 →