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)10.3.36.0/23

network10.3.36.0/23

broadcast10.3.37.255

first host10.3.36.1

last host10.3.37.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.3.36.0/23

address00001010.00000011.00100100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000011.00100100.00000000

broadcast00001010.00000011.00100101.11111111

green = network part, grey = host part

hex0x0a032400

decimal167977984

reverse dns0.36.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:2400

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.36.0/30	10.3.36.1 – 10.3.36.2	10.3.36.3
2	10.3.36.4/30	10.3.36.5 – 10.3.36.6	10.3.36.7
3	10.3.36.8/30	10.3.36.9 – 10.3.36.10	10.3.36.11
4	10.3.36.12/30	10.3.36.13 – 10.3.36.14	10.3.36.15
5	10.3.36.16/30	10.3.36.17 – 10.3.36.18	10.3.36.19
6	10.3.36.20/30	10.3.36.21 – 10.3.36.22	10.3.36.23
7	10.3.36.24/30	10.3.36.25 – 10.3.36.26	10.3.36.27
8	10.3.36.28/30	10.3.36.29 – 10.3.36.30	10.3.36.31
9	10.3.36.32/30	10.3.36.33 – 10.3.36.34	10.3.36.35
10	10.3.36.36/30	10.3.36.37 – 10.3.36.38	10.3.36.39
11	10.3.36.40/30	10.3.36.41 – 10.3.36.42	10.3.36.43
12	10.3.36.44/30	10.3.36.45 – 10.3.36.46	10.3.36.47
13	10.3.36.48/30	10.3.36.49 – 10.3.36.50	10.3.36.51
14	10.3.36.52/30	10.3.36.53 – 10.3.36.54	10.3.36.55
15	10.3.36.56/30	10.3.36.57 – 10.3.36.58	10.3.36.59
16	10.3.36.60/30	10.3.36.61 – 10.3.36.62	10.3.36.63
17	10.3.36.64/30	10.3.36.65 – 10.3.36.66	10.3.36.67
18	10.3.36.68/30	10.3.36.69 – 10.3.36.70	10.3.36.71
19	10.3.36.72/30	10.3.36.73 – 10.3.36.74	10.3.36.75
20	10.3.36.76/30	10.3.36.77 – 10.3.36.78	10.3.36.79
21	10.3.36.80/30	10.3.36.81 – 10.3.36.82	10.3.36.83
22	10.3.36.84/30	10.3.36.85 – 10.3.36.86	10.3.36.87
23	10.3.36.88/30	10.3.36.89 – 10.3.36.90	10.3.36.91
24	10.3.36.92/30	10.3.36.93 – 10.3.36.94	10.3.36.95
25	10.3.36.96/30	10.3.36.97 – 10.3.36.98	10.3.36.99
26	10.3.36.100/30	10.3.36.101 – 10.3.36.102	10.3.36.103
27	10.3.36.104/30	10.3.36.105 – 10.3.36.106	10.3.36.107
28	10.3.36.108/30	10.3.36.109 – 10.3.36.110	10.3.36.111
29	10.3.36.112/30	10.3.36.113 – 10.3.36.114	10.3.36.115
30	10.3.36.116/30	10.3.36.117 – 10.3.36.118	10.3.36.119
31	10.3.36.120/30	10.3.36.121 – 10.3.36.122	10.3.36.123
32	10.3.36.124/30	10.3.36.125 – 10.3.36.126	10.3.36.127
33	10.3.36.128/30	10.3.36.129 – 10.3.36.130	10.3.36.131
34	10.3.36.132/30	10.3.36.133 – 10.3.36.134	10.3.36.135
35	10.3.36.136/30	10.3.36.137 – 10.3.36.138	10.3.36.139
36	10.3.36.140/30	10.3.36.141 – 10.3.36.142	10.3.36.143
37	10.3.36.144/30	10.3.36.145 – 10.3.36.146	10.3.36.147
38	10.3.36.148/30	10.3.36.149 – 10.3.36.150	10.3.36.151
39	10.3.36.152/30	10.3.36.153 – 10.3.36.154	10.3.36.155
40	10.3.36.156/30	10.3.36.157 – 10.3.36.158	10.3.36.159
41	10.3.36.160/30	10.3.36.161 – 10.3.36.162	10.3.36.163
42	10.3.36.164/30	10.3.36.165 – 10.3.36.166	10.3.36.167
43	10.3.36.168/30	10.3.36.169 – 10.3.36.170	10.3.36.171
44	10.3.36.172/30	10.3.36.173 – 10.3.36.174	10.3.36.175
45	10.3.36.176/30	10.3.36.177 – 10.3.36.178	10.3.36.179
46	10.3.36.180/30	10.3.36.181 – 10.3.36.182	10.3.36.183
47	10.3.36.184/30	10.3.36.185 – 10.3.36.186	10.3.36.187
48	10.3.36.188/30	10.3.36.189 – 10.3.36.190	10.3.36.191
49	10.3.36.192/30	10.3.36.193 – 10.3.36.194	10.3.36.195
50	10.3.36.196/30	10.3.36.197 – 10.3.36.198	10.3.36.199
51	10.3.36.200/30	10.3.36.201 – 10.3.36.202	10.3.36.203
52	10.3.36.204/30	10.3.36.205 – 10.3.36.206	10.3.36.207
53	10.3.36.208/30	10.3.36.209 – 10.3.36.210	10.3.36.211
54	10.3.36.212/30	10.3.36.213 – 10.3.36.214	10.3.36.215
55	10.3.36.216/30	10.3.36.217 – 10.3.36.218	10.3.36.219
56	10.3.36.220/30	10.3.36.221 – 10.3.36.222	10.3.36.223
57	10.3.36.224/30	10.3.36.225 – 10.3.36.226	10.3.36.227
58	10.3.36.228/30	10.3.36.229 – 10.3.36.230	10.3.36.231
59	10.3.36.232/30	10.3.36.233 – 10.3.36.234	10.3.36.235
60	10.3.36.236/30	10.3.36.237 – 10.3.36.238	10.3.36.239
61	10.3.36.240/30	10.3.36.241 – 10.3.36.242	10.3.36.243
62	10.3.36.244/30	10.3.36.245 – 10.3.36.246	10.3.36.247
63	10.3.36.248/30	10.3.36.249 – 10.3.36.250	10.3.36.251
64	10.3.36.252/30	10.3.36.253 – 10.3.36.254	10.3.36.255
65	10.3.37.0/30	10.3.37.1 – 10.3.37.2	10.3.37.3
66	10.3.37.4/30	10.3.37.5 – 10.3.37.6	10.3.37.7
67	10.3.37.8/30	10.3.37.9 – 10.3.37.10	10.3.37.11
68	10.3.37.12/30	10.3.37.13 – 10.3.37.14	10.3.37.15
69	10.3.37.16/30	10.3.37.17 – 10.3.37.18	10.3.37.19
70	10.3.37.20/30	10.3.37.21 – 10.3.37.22	10.3.37.23
71	10.3.37.24/30	10.3.37.25 – 10.3.37.26	10.3.37.27
72	10.3.37.28/30	10.3.37.29 – 10.3.37.30	10.3.37.31
73	10.3.37.32/30	10.3.37.33 – 10.3.37.34	10.3.37.35
74	10.3.37.36/30	10.3.37.37 – 10.3.37.38	10.3.37.39
75	10.3.37.40/30	10.3.37.41 – 10.3.37.42	10.3.37.43
76	10.3.37.44/30	10.3.37.45 – 10.3.37.46	10.3.37.47
77	10.3.37.48/30	10.3.37.49 – 10.3.37.50	10.3.37.51
78	10.3.37.52/30	10.3.37.53 – 10.3.37.54	10.3.37.55
79	10.3.37.56/30	10.3.37.57 – 10.3.37.58	10.3.37.59
80	10.3.37.60/30	10.3.37.61 – 10.3.37.62	10.3.37.63
81	10.3.37.64/30	10.3.37.65 – 10.3.37.66	10.3.37.67
82	10.3.37.68/30	10.3.37.69 – 10.3.37.70	10.3.37.71
83	10.3.37.72/30	10.3.37.73 – 10.3.37.74	10.3.37.75
84	10.3.37.76/30	10.3.37.77 – 10.3.37.78	10.3.37.79
85	10.3.37.80/30	10.3.37.81 – 10.3.37.82	10.3.37.83
86	10.3.37.84/30	10.3.37.85 – 10.3.37.86	10.3.37.87
87	10.3.37.88/30	10.3.37.89 – 10.3.37.90	10.3.37.91
88	10.3.37.92/30	10.3.37.93 – 10.3.37.94	10.3.37.95
89	10.3.37.96/30	10.3.37.97 – 10.3.37.98	10.3.37.99
90	10.3.37.100/30	10.3.37.101 – 10.3.37.102	10.3.37.103
91	10.3.37.104/30	10.3.37.105 – 10.3.37.106	10.3.37.107
92	10.3.37.108/30	10.3.37.109 – 10.3.37.110	10.3.37.111
93	10.3.37.112/30	10.3.37.113 – 10.3.37.114	10.3.37.115
94	10.3.37.116/30	10.3.37.117 – 10.3.37.118	10.3.37.119
95	10.3.37.120/30	10.3.37.121 – 10.3.37.122	10.3.37.123
96	10.3.37.124/30	10.3.37.125 – 10.3.37.126	10.3.37.127
97	10.3.37.128/30	10.3.37.129 – 10.3.37.130	10.3.37.131
98	10.3.37.132/30	10.3.37.133 – 10.3.37.134	10.3.37.135
99	10.3.37.136/30	10.3.37.137 – 10.3.37.138	10.3.37.139
100	10.3.37.140/30	10.3.37.141 – 10.3.37.142	10.3.37.143
101	10.3.37.144/30	10.3.37.145 – 10.3.37.146	10.3.37.147
102	10.3.37.148/30	10.3.37.149 – 10.3.37.150	10.3.37.151
103	10.3.37.152/30	10.3.37.153 – 10.3.37.154	10.3.37.155
104	10.3.37.156/30	10.3.37.157 – 10.3.37.158	10.3.37.159
105	10.3.37.160/30	10.3.37.161 – 10.3.37.162	10.3.37.163
106	10.3.37.164/30	10.3.37.165 – 10.3.37.166	10.3.37.167
107	10.3.37.168/30	10.3.37.169 – 10.3.37.170	10.3.37.171
108	10.3.37.172/30	10.3.37.173 – 10.3.37.174	10.3.37.175
109	10.3.37.176/30	10.3.37.177 – 10.3.37.178	10.3.37.179
110	10.3.37.180/30	10.3.37.181 – 10.3.37.182	10.3.37.183
111	10.3.37.184/30	10.3.37.185 – 10.3.37.186	10.3.37.187
112	10.3.37.188/30	10.3.37.189 – 10.3.37.190	10.3.37.191
113	10.3.37.192/30	10.3.37.193 – 10.3.37.194	10.3.37.195
114	10.3.37.196/30	10.3.37.197 – 10.3.37.198	10.3.37.199
115	10.3.37.200/30	10.3.37.201 – 10.3.37.202	10.3.37.203
116	10.3.37.204/30	10.3.37.205 – 10.3.37.206	10.3.37.207
117	10.3.37.208/30	10.3.37.209 – 10.3.37.210	10.3.37.211
118	10.3.37.212/30	10.3.37.213 – 10.3.37.214	10.3.37.215
119	10.3.37.216/30	10.3.37.217 – 10.3.37.218	10.3.37.219
120	10.3.37.220/30	10.3.37.221 – 10.3.37.222	10.3.37.223
121	10.3.37.224/30	10.3.37.225 – 10.3.37.226	10.3.37.227
122	10.3.37.228/30	10.3.37.229 – 10.3.37.230	10.3.37.231
123	10.3.37.232/30	10.3.37.233 – 10.3.37.234	10.3.37.235
124	10.3.37.236/30	10.3.37.237 – 10.3.37.238	10.3.37.239
125	10.3.37.240/30	10.3.37.241 – 10.3.37.242	10.3.37.243
126	10.3.37.244/30	10.3.37.245 – 10.3.37.246	10.3.37.247
127	10.3.37.248/30	10.3.37.249 – 10.3.37.250	10.3.37.251
128	10.3.37.252/30	10.3.37.253 – 10.3.37.254	10.3.37.255

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 →