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)10.3.56.0/23

network10.3.56.0/23

broadcast10.3.57.255

first host10.3.56.1

last host10.3.57.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.3.56.0/23

address00001010.00000011.00111000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000011.00111000.00000000

broadcast00001010.00000011.00111001.11111111

green = network part, grey = host part

hex0x0a033800

decimal167983104

reverse dns0.56.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:3800

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.56.0/30	10.3.56.1 – 10.3.56.2	10.3.56.3
2	10.3.56.4/30	10.3.56.5 – 10.3.56.6	10.3.56.7
3	10.3.56.8/30	10.3.56.9 – 10.3.56.10	10.3.56.11
4	10.3.56.12/30	10.3.56.13 – 10.3.56.14	10.3.56.15
5	10.3.56.16/30	10.3.56.17 – 10.3.56.18	10.3.56.19
6	10.3.56.20/30	10.3.56.21 – 10.3.56.22	10.3.56.23
7	10.3.56.24/30	10.3.56.25 – 10.3.56.26	10.3.56.27
8	10.3.56.28/30	10.3.56.29 – 10.3.56.30	10.3.56.31
9	10.3.56.32/30	10.3.56.33 – 10.3.56.34	10.3.56.35
10	10.3.56.36/30	10.3.56.37 – 10.3.56.38	10.3.56.39
11	10.3.56.40/30	10.3.56.41 – 10.3.56.42	10.3.56.43
12	10.3.56.44/30	10.3.56.45 – 10.3.56.46	10.3.56.47
13	10.3.56.48/30	10.3.56.49 – 10.3.56.50	10.3.56.51
14	10.3.56.52/30	10.3.56.53 – 10.3.56.54	10.3.56.55
15	10.3.56.56/30	10.3.56.57 – 10.3.56.58	10.3.56.59
16	10.3.56.60/30	10.3.56.61 – 10.3.56.62	10.3.56.63
17	10.3.56.64/30	10.3.56.65 – 10.3.56.66	10.3.56.67
18	10.3.56.68/30	10.3.56.69 – 10.3.56.70	10.3.56.71
19	10.3.56.72/30	10.3.56.73 – 10.3.56.74	10.3.56.75
20	10.3.56.76/30	10.3.56.77 – 10.3.56.78	10.3.56.79
21	10.3.56.80/30	10.3.56.81 – 10.3.56.82	10.3.56.83
22	10.3.56.84/30	10.3.56.85 – 10.3.56.86	10.3.56.87
23	10.3.56.88/30	10.3.56.89 – 10.3.56.90	10.3.56.91
24	10.3.56.92/30	10.3.56.93 – 10.3.56.94	10.3.56.95
25	10.3.56.96/30	10.3.56.97 – 10.3.56.98	10.3.56.99
26	10.3.56.100/30	10.3.56.101 – 10.3.56.102	10.3.56.103
27	10.3.56.104/30	10.3.56.105 – 10.3.56.106	10.3.56.107
28	10.3.56.108/30	10.3.56.109 – 10.3.56.110	10.3.56.111
29	10.3.56.112/30	10.3.56.113 – 10.3.56.114	10.3.56.115
30	10.3.56.116/30	10.3.56.117 – 10.3.56.118	10.3.56.119
31	10.3.56.120/30	10.3.56.121 – 10.3.56.122	10.3.56.123
32	10.3.56.124/30	10.3.56.125 – 10.3.56.126	10.3.56.127
33	10.3.56.128/30	10.3.56.129 – 10.3.56.130	10.3.56.131
34	10.3.56.132/30	10.3.56.133 – 10.3.56.134	10.3.56.135
35	10.3.56.136/30	10.3.56.137 – 10.3.56.138	10.3.56.139
36	10.3.56.140/30	10.3.56.141 – 10.3.56.142	10.3.56.143
37	10.3.56.144/30	10.3.56.145 – 10.3.56.146	10.3.56.147
38	10.3.56.148/30	10.3.56.149 – 10.3.56.150	10.3.56.151
39	10.3.56.152/30	10.3.56.153 – 10.3.56.154	10.3.56.155
40	10.3.56.156/30	10.3.56.157 – 10.3.56.158	10.3.56.159
41	10.3.56.160/30	10.3.56.161 – 10.3.56.162	10.3.56.163
42	10.3.56.164/30	10.3.56.165 – 10.3.56.166	10.3.56.167
43	10.3.56.168/30	10.3.56.169 – 10.3.56.170	10.3.56.171
44	10.3.56.172/30	10.3.56.173 – 10.3.56.174	10.3.56.175
45	10.3.56.176/30	10.3.56.177 – 10.3.56.178	10.3.56.179
46	10.3.56.180/30	10.3.56.181 – 10.3.56.182	10.3.56.183
47	10.3.56.184/30	10.3.56.185 – 10.3.56.186	10.3.56.187
48	10.3.56.188/30	10.3.56.189 – 10.3.56.190	10.3.56.191
49	10.3.56.192/30	10.3.56.193 – 10.3.56.194	10.3.56.195
50	10.3.56.196/30	10.3.56.197 – 10.3.56.198	10.3.56.199
51	10.3.56.200/30	10.3.56.201 – 10.3.56.202	10.3.56.203
52	10.3.56.204/30	10.3.56.205 – 10.3.56.206	10.3.56.207
53	10.3.56.208/30	10.3.56.209 – 10.3.56.210	10.3.56.211
54	10.3.56.212/30	10.3.56.213 – 10.3.56.214	10.3.56.215
55	10.3.56.216/30	10.3.56.217 – 10.3.56.218	10.3.56.219
56	10.3.56.220/30	10.3.56.221 – 10.3.56.222	10.3.56.223
57	10.3.56.224/30	10.3.56.225 – 10.3.56.226	10.3.56.227
58	10.3.56.228/30	10.3.56.229 – 10.3.56.230	10.3.56.231
59	10.3.56.232/30	10.3.56.233 – 10.3.56.234	10.3.56.235
60	10.3.56.236/30	10.3.56.237 – 10.3.56.238	10.3.56.239
61	10.3.56.240/30	10.3.56.241 – 10.3.56.242	10.3.56.243
62	10.3.56.244/30	10.3.56.245 – 10.3.56.246	10.3.56.247
63	10.3.56.248/30	10.3.56.249 – 10.3.56.250	10.3.56.251
64	10.3.56.252/30	10.3.56.253 – 10.3.56.254	10.3.56.255
65	10.3.57.0/30	10.3.57.1 – 10.3.57.2	10.3.57.3
66	10.3.57.4/30	10.3.57.5 – 10.3.57.6	10.3.57.7
67	10.3.57.8/30	10.3.57.9 – 10.3.57.10	10.3.57.11
68	10.3.57.12/30	10.3.57.13 – 10.3.57.14	10.3.57.15
69	10.3.57.16/30	10.3.57.17 – 10.3.57.18	10.3.57.19
70	10.3.57.20/30	10.3.57.21 – 10.3.57.22	10.3.57.23
71	10.3.57.24/30	10.3.57.25 – 10.3.57.26	10.3.57.27
72	10.3.57.28/30	10.3.57.29 – 10.3.57.30	10.3.57.31
73	10.3.57.32/30	10.3.57.33 – 10.3.57.34	10.3.57.35
74	10.3.57.36/30	10.3.57.37 – 10.3.57.38	10.3.57.39
75	10.3.57.40/30	10.3.57.41 – 10.3.57.42	10.3.57.43
76	10.3.57.44/30	10.3.57.45 – 10.3.57.46	10.3.57.47
77	10.3.57.48/30	10.3.57.49 – 10.3.57.50	10.3.57.51
78	10.3.57.52/30	10.3.57.53 – 10.3.57.54	10.3.57.55
79	10.3.57.56/30	10.3.57.57 – 10.3.57.58	10.3.57.59
80	10.3.57.60/30	10.3.57.61 – 10.3.57.62	10.3.57.63
81	10.3.57.64/30	10.3.57.65 – 10.3.57.66	10.3.57.67
82	10.3.57.68/30	10.3.57.69 – 10.3.57.70	10.3.57.71
83	10.3.57.72/30	10.3.57.73 – 10.3.57.74	10.3.57.75
84	10.3.57.76/30	10.3.57.77 – 10.3.57.78	10.3.57.79
85	10.3.57.80/30	10.3.57.81 – 10.3.57.82	10.3.57.83
86	10.3.57.84/30	10.3.57.85 – 10.3.57.86	10.3.57.87
87	10.3.57.88/30	10.3.57.89 – 10.3.57.90	10.3.57.91
88	10.3.57.92/30	10.3.57.93 – 10.3.57.94	10.3.57.95
89	10.3.57.96/30	10.3.57.97 – 10.3.57.98	10.3.57.99
90	10.3.57.100/30	10.3.57.101 – 10.3.57.102	10.3.57.103
91	10.3.57.104/30	10.3.57.105 – 10.3.57.106	10.3.57.107
92	10.3.57.108/30	10.3.57.109 – 10.3.57.110	10.3.57.111
93	10.3.57.112/30	10.3.57.113 – 10.3.57.114	10.3.57.115
94	10.3.57.116/30	10.3.57.117 – 10.3.57.118	10.3.57.119
95	10.3.57.120/30	10.3.57.121 – 10.3.57.122	10.3.57.123
96	10.3.57.124/30	10.3.57.125 – 10.3.57.126	10.3.57.127
97	10.3.57.128/30	10.3.57.129 – 10.3.57.130	10.3.57.131
98	10.3.57.132/30	10.3.57.133 – 10.3.57.134	10.3.57.135
99	10.3.57.136/30	10.3.57.137 – 10.3.57.138	10.3.57.139
100	10.3.57.140/30	10.3.57.141 – 10.3.57.142	10.3.57.143
101	10.3.57.144/30	10.3.57.145 – 10.3.57.146	10.3.57.147
102	10.3.57.148/30	10.3.57.149 – 10.3.57.150	10.3.57.151
103	10.3.57.152/30	10.3.57.153 – 10.3.57.154	10.3.57.155
104	10.3.57.156/30	10.3.57.157 – 10.3.57.158	10.3.57.159
105	10.3.57.160/30	10.3.57.161 – 10.3.57.162	10.3.57.163
106	10.3.57.164/30	10.3.57.165 – 10.3.57.166	10.3.57.167
107	10.3.57.168/30	10.3.57.169 – 10.3.57.170	10.3.57.171
108	10.3.57.172/30	10.3.57.173 – 10.3.57.174	10.3.57.175
109	10.3.57.176/30	10.3.57.177 – 10.3.57.178	10.3.57.179
110	10.3.57.180/30	10.3.57.181 – 10.3.57.182	10.3.57.183
111	10.3.57.184/30	10.3.57.185 – 10.3.57.186	10.3.57.187
112	10.3.57.188/30	10.3.57.189 – 10.3.57.190	10.3.57.191
113	10.3.57.192/30	10.3.57.193 – 10.3.57.194	10.3.57.195
114	10.3.57.196/30	10.3.57.197 – 10.3.57.198	10.3.57.199
115	10.3.57.200/30	10.3.57.201 – 10.3.57.202	10.3.57.203
116	10.3.57.204/30	10.3.57.205 – 10.3.57.206	10.3.57.207
117	10.3.57.208/30	10.3.57.209 – 10.3.57.210	10.3.57.211
118	10.3.57.212/30	10.3.57.213 – 10.3.57.214	10.3.57.215
119	10.3.57.216/30	10.3.57.217 – 10.3.57.218	10.3.57.219
120	10.3.57.220/30	10.3.57.221 – 10.3.57.222	10.3.57.223
121	10.3.57.224/30	10.3.57.225 – 10.3.57.226	10.3.57.227
122	10.3.57.228/30	10.3.57.229 – 10.3.57.230	10.3.57.231
123	10.3.57.232/30	10.3.57.233 – 10.3.57.234	10.3.57.235
124	10.3.57.236/30	10.3.57.237 – 10.3.57.238	10.3.57.239
125	10.3.57.240/30	10.3.57.241 – 10.3.57.242	10.3.57.243
126	10.3.57.244/30	10.3.57.245 – 10.3.57.246	10.3.57.247
127	10.3.57.248/30	10.3.57.249 – 10.3.57.250	10.3.57.251
128	10.3.57.252/30	10.3.57.253 – 10.3.57.254	10.3.57.255

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 →