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)10.131.236.0/23

network10.131.236.0/23

broadcast10.131.237.255

first host10.131.236.1

last host10.131.237.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.131.236.0/23

address00001010.10000011.11101100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10000011.11101100.00000000

broadcast00001010.10000011.11101101.11111111

green = network part, grey = host part

hex0x0a83ec00

decimal176417792

reverse dns0.236.131.10.in-addr.arpa

ipv4-mapped::ffff:a83:ec00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.131.236.0/30	10.131.236.1 – 10.131.236.2	10.131.236.3
2	10.131.236.4/30	10.131.236.5 – 10.131.236.6	10.131.236.7
3	10.131.236.8/30	10.131.236.9 – 10.131.236.10	10.131.236.11
4	10.131.236.12/30	10.131.236.13 – 10.131.236.14	10.131.236.15
5	10.131.236.16/30	10.131.236.17 – 10.131.236.18	10.131.236.19
6	10.131.236.20/30	10.131.236.21 – 10.131.236.22	10.131.236.23
7	10.131.236.24/30	10.131.236.25 – 10.131.236.26	10.131.236.27
8	10.131.236.28/30	10.131.236.29 – 10.131.236.30	10.131.236.31
9	10.131.236.32/30	10.131.236.33 – 10.131.236.34	10.131.236.35
10	10.131.236.36/30	10.131.236.37 – 10.131.236.38	10.131.236.39
11	10.131.236.40/30	10.131.236.41 – 10.131.236.42	10.131.236.43
12	10.131.236.44/30	10.131.236.45 – 10.131.236.46	10.131.236.47
13	10.131.236.48/30	10.131.236.49 – 10.131.236.50	10.131.236.51
14	10.131.236.52/30	10.131.236.53 – 10.131.236.54	10.131.236.55
15	10.131.236.56/30	10.131.236.57 – 10.131.236.58	10.131.236.59
16	10.131.236.60/30	10.131.236.61 – 10.131.236.62	10.131.236.63
17	10.131.236.64/30	10.131.236.65 – 10.131.236.66	10.131.236.67
18	10.131.236.68/30	10.131.236.69 – 10.131.236.70	10.131.236.71
19	10.131.236.72/30	10.131.236.73 – 10.131.236.74	10.131.236.75
20	10.131.236.76/30	10.131.236.77 – 10.131.236.78	10.131.236.79
21	10.131.236.80/30	10.131.236.81 – 10.131.236.82	10.131.236.83
22	10.131.236.84/30	10.131.236.85 – 10.131.236.86	10.131.236.87
23	10.131.236.88/30	10.131.236.89 – 10.131.236.90	10.131.236.91
24	10.131.236.92/30	10.131.236.93 – 10.131.236.94	10.131.236.95
25	10.131.236.96/30	10.131.236.97 – 10.131.236.98	10.131.236.99
26	10.131.236.100/30	10.131.236.101 – 10.131.236.102	10.131.236.103
27	10.131.236.104/30	10.131.236.105 – 10.131.236.106	10.131.236.107
28	10.131.236.108/30	10.131.236.109 – 10.131.236.110	10.131.236.111
29	10.131.236.112/30	10.131.236.113 – 10.131.236.114	10.131.236.115
30	10.131.236.116/30	10.131.236.117 – 10.131.236.118	10.131.236.119
31	10.131.236.120/30	10.131.236.121 – 10.131.236.122	10.131.236.123
32	10.131.236.124/30	10.131.236.125 – 10.131.236.126	10.131.236.127
33	10.131.236.128/30	10.131.236.129 – 10.131.236.130	10.131.236.131
34	10.131.236.132/30	10.131.236.133 – 10.131.236.134	10.131.236.135
35	10.131.236.136/30	10.131.236.137 – 10.131.236.138	10.131.236.139
36	10.131.236.140/30	10.131.236.141 – 10.131.236.142	10.131.236.143
37	10.131.236.144/30	10.131.236.145 – 10.131.236.146	10.131.236.147
38	10.131.236.148/30	10.131.236.149 – 10.131.236.150	10.131.236.151
39	10.131.236.152/30	10.131.236.153 – 10.131.236.154	10.131.236.155
40	10.131.236.156/30	10.131.236.157 – 10.131.236.158	10.131.236.159
41	10.131.236.160/30	10.131.236.161 – 10.131.236.162	10.131.236.163
42	10.131.236.164/30	10.131.236.165 – 10.131.236.166	10.131.236.167
43	10.131.236.168/30	10.131.236.169 – 10.131.236.170	10.131.236.171
44	10.131.236.172/30	10.131.236.173 – 10.131.236.174	10.131.236.175
45	10.131.236.176/30	10.131.236.177 – 10.131.236.178	10.131.236.179
46	10.131.236.180/30	10.131.236.181 – 10.131.236.182	10.131.236.183
47	10.131.236.184/30	10.131.236.185 – 10.131.236.186	10.131.236.187
48	10.131.236.188/30	10.131.236.189 – 10.131.236.190	10.131.236.191
49	10.131.236.192/30	10.131.236.193 – 10.131.236.194	10.131.236.195
50	10.131.236.196/30	10.131.236.197 – 10.131.236.198	10.131.236.199
51	10.131.236.200/30	10.131.236.201 – 10.131.236.202	10.131.236.203
52	10.131.236.204/30	10.131.236.205 – 10.131.236.206	10.131.236.207
53	10.131.236.208/30	10.131.236.209 – 10.131.236.210	10.131.236.211
54	10.131.236.212/30	10.131.236.213 – 10.131.236.214	10.131.236.215
55	10.131.236.216/30	10.131.236.217 – 10.131.236.218	10.131.236.219
56	10.131.236.220/30	10.131.236.221 – 10.131.236.222	10.131.236.223
57	10.131.236.224/30	10.131.236.225 – 10.131.236.226	10.131.236.227
58	10.131.236.228/30	10.131.236.229 – 10.131.236.230	10.131.236.231
59	10.131.236.232/30	10.131.236.233 – 10.131.236.234	10.131.236.235
60	10.131.236.236/30	10.131.236.237 – 10.131.236.238	10.131.236.239
61	10.131.236.240/30	10.131.236.241 – 10.131.236.242	10.131.236.243
62	10.131.236.244/30	10.131.236.245 – 10.131.236.246	10.131.236.247
63	10.131.236.248/30	10.131.236.249 – 10.131.236.250	10.131.236.251
64	10.131.236.252/30	10.131.236.253 – 10.131.236.254	10.131.236.255
65	10.131.237.0/30	10.131.237.1 – 10.131.237.2	10.131.237.3
66	10.131.237.4/30	10.131.237.5 – 10.131.237.6	10.131.237.7
67	10.131.237.8/30	10.131.237.9 – 10.131.237.10	10.131.237.11
68	10.131.237.12/30	10.131.237.13 – 10.131.237.14	10.131.237.15
69	10.131.237.16/30	10.131.237.17 – 10.131.237.18	10.131.237.19
70	10.131.237.20/30	10.131.237.21 – 10.131.237.22	10.131.237.23
71	10.131.237.24/30	10.131.237.25 – 10.131.237.26	10.131.237.27
72	10.131.237.28/30	10.131.237.29 – 10.131.237.30	10.131.237.31
73	10.131.237.32/30	10.131.237.33 – 10.131.237.34	10.131.237.35
74	10.131.237.36/30	10.131.237.37 – 10.131.237.38	10.131.237.39
75	10.131.237.40/30	10.131.237.41 – 10.131.237.42	10.131.237.43
76	10.131.237.44/30	10.131.237.45 – 10.131.237.46	10.131.237.47
77	10.131.237.48/30	10.131.237.49 – 10.131.237.50	10.131.237.51
78	10.131.237.52/30	10.131.237.53 – 10.131.237.54	10.131.237.55
79	10.131.237.56/30	10.131.237.57 – 10.131.237.58	10.131.237.59
80	10.131.237.60/30	10.131.237.61 – 10.131.237.62	10.131.237.63
81	10.131.237.64/30	10.131.237.65 – 10.131.237.66	10.131.237.67
82	10.131.237.68/30	10.131.237.69 – 10.131.237.70	10.131.237.71
83	10.131.237.72/30	10.131.237.73 – 10.131.237.74	10.131.237.75
84	10.131.237.76/30	10.131.237.77 – 10.131.237.78	10.131.237.79
85	10.131.237.80/30	10.131.237.81 – 10.131.237.82	10.131.237.83
86	10.131.237.84/30	10.131.237.85 – 10.131.237.86	10.131.237.87
87	10.131.237.88/30	10.131.237.89 – 10.131.237.90	10.131.237.91
88	10.131.237.92/30	10.131.237.93 – 10.131.237.94	10.131.237.95
89	10.131.237.96/30	10.131.237.97 – 10.131.237.98	10.131.237.99
90	10.131.237.100/30	10.131.237.101 – 10.131.237.102	10.131.237.103
91	10.131.237.104/30	10.131.237.105 – 10.131.237.106	10.131.237.107
92	10.131.237.108/30	10.131.237.109 – 10.131.237.110	10.131.237.111
93	10.131.237.112/30	10.131.237.113 – 10.131.237.114	10.131.237.115
94	10.131.237.116/30	10.131.237.117 – 10.131.237.118	10.131.237.119
95	10.131.237.120/30	10.131.237.121 – 10.131.237.122	10.131.237.123
96	10.131.237.124/30	10.131.237.125 – 10.131.237.126	10.131.237.127
97	10.131.237.128/30	10.131.237.129 – 10.131.237.130	10.131.237.131
98	10.131.237.132/30	10.131.237.133 – 10.131.237.134	10.131.237.135
99	10.131.237.136/30	10.131.237.137 – 10.131.237.138	10.131.237.139
100	10.131.237.140/30	10.131.237.141 – 10.131.237.142	10.131.237.143
101	10.131.237.144/30	10.131.237.145 – 10.131.237.146	10.131.237.147
102	10.131.237.148/30	10.131.237.149 – 10.131.237.150	10.131.237.151
103	10.131.237.152/30	10.131.237.153 – 10.131.237.154	10.131.237.155
104	10.131.237.156/30	10.131.237.157 – 10.131.237.158	10.131.237.159
105	10.131.237.160/30	10.131.237.161 – 10.131.237.162	10.131.237.163
106	10.131.237.164/30	10.131.237.165 – 10.131.237.166	10.131.237.167
107	10.131.237.168/30	10.131.237.169 – 10.131.237.170	10.131.237.171
108	10.131.237.172/30	10.131.237.173 – 10.131.237.174	10.131.237.175
109	10.131.237.176/30	10.131.237.177 – 10.131.237.178	10.131.237.179
110	10.131.237.180/30	10.131.237.181 – 10.131.237.182	10.131.237.183
111	10.131.237.184/30	10.131.237.185 – 10.131.237.186	10.131.237.187
112	10.131.237.188/30	10.131.237.189 – 10.131.237.190	10.131.237.191
113	10.131.237.192/30	10.131.237.193 – 10.131.237.194	10.131.237.195
114	10.131.237.196/30	10.131.237.197 – 10.131.237.198	10.131.237.199
115	10.131.237.200/30	10.131.237.201 – 10.131.237.202	10.131.237.203
116	10.131.237.204/30	10.131.237.205 – 10.131.237.206	10.131.237.207
117	10.131.237.208/30	10.131.237.209 – 10.131.237.210	10.131.237.211
118	10.131.237.212/30	10.131.237.213 – 10.131.237.214	10.131.237.215
119	10.131.237.216/30	10.131.237.217 – 10.131.237.218	10.131.237.219
120	10.131.237.220/30	10.131.237.221 – 10.131.237.222	10.131.237.223
121	10.131.237.224/30	10.131.237.225 – 10.131.237.226	10.131.237.227
122	10.131.237.228/30	10.131.237.229 – 10.131.237.230	10.131.237.231
123	10.131.237.232/30	10.131.237.233 – 10.131.237.234	10.131.237.235
124	10.131.237.236/30	10.131.237.237 – 10.131.237.238	10.131.237.239
125	10.131.237.240/30	10.131.237.241 – 10.131.237.242	10.131.237.243
126	10.131.237.244/30	10.131.237.245 – 10.131.237.246	10.131.237.247
127	10.131.237.248/30	10.131.237.249 – 10.131.237.250	10.131.237.251
128	10.131.237.252/30	10.131.237.253 – 10.131.237.254	10.131.237.255

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 →