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)10.1.208.0/23

network10.1.208.0/23

broadcast10.1.209.255

first host10.1.208.1

last host10.1.209.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.1.208.0/23

address00001010.00000001.11010000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000001.11010000.00000000

broadcast00001010.00000001.11010001.11111111

green = network part, grey = host part

hex0x0a01d000

decimal167890944

reverse dns0.208.1.10.in-addr.arpa

ipv4-mapped::ffff:a01:d000

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.1.208.0/30	10.1.208.1 – 10.1.208.2	10.1.208.3
2	10.1.208.4/30	10.1.208.5 – 10.1.208.6	10.1.208.7
3	10.1.208.8/30	10.1.208.9 – 10.1.208.10	10.1.208.11
4	10.1.208.12/30	10.1.208.13 – 10.1.208.14	10.1.208.15
5	10.1.208.16/30	10.1.208.17 – 10.1.208.18	10.1.208.19
6	10.1.208.20/30	10.1.208.21 – 10.1.208.22	10.1.208.23
7	10.1.208.24/30	10.1.208.25 – 10.1.208.26	10.1.208.27
8	10.1.208.28/30	10.1.208.29 – 10.1.208.30	10.1.208.31
9	10.1.208.32/30	10.1.208.33 – 10.1.208.34	10.1.208.35
10	10.1.208.36/30	10.1.208.37 – 10.1.208.38	10.1.208.39
11	10.1.208.40/30	10.1.208.41 – 10.1.208.42	10.1.208.43
12	10.1.208.44/30	10.1.208.45 – 10.1.208.46	10.1.208.47
13	10.1.208.48/30	10.1.208.49 – 10.1.208.50	10.1.208.51
14	10.1.208.52/30	10.1.208.53 – 10.1.208.54	10.1.208.55
15	10.1.208.56/30	10.1.208.57 – 10.1.208.58	10.1.208.59
16	10.1.208.60/30	10.1.208.61 – 10.1.208.62	10.1.208.63
17	10.1.208.64/30	10.1.208.65 – 10.1.208.66	10.1.208.67
18	10.1.208.68/30	10.1.208.69 – 10.1.208.70	10.1.208.71
19	10.1.208.72/30	10.1.208.73 – 10.1.208.74	10.1.208.75
20	10.1.208.76/30	10.1.208.77 – 10.1.208.78	10.1.208.79
21	10.1.208.80/30	10.1.208.81 – 10.1.208.82	10.1.208.83
22	10.1.208.84/30	10.1.208.85 – 10.1.208.86	10.1.208.87
23	10.1.208.88/30	10.1.208.89 – 10.1.208.90	10.1.208.91
24	10.1.208.92/30	10.1.208.93 – 10.1.208.94	10.1.208.95
25	10.1.208.96/30	10.1.208.97 – 10.1.208.98	10.1.208.99
26	10.1.208.100/30	10.1.208.101 – 10.1.208.102	10.1.208.103
27	10.1.208.104/30	10.1.208.105 – 10.1.208.106	10.1.208.107
28	10.1.208.108/30	10.1.208.109 – 10.1.208.110	10.1.208.111
29	10.1.208.112/30	10.1.208.113 – 10.1.208.114	10.1.208.115
30	10.1.208.116/30	10.1.208.117 – 10.1.208.118	10.1.208.119
31	10.1.208.120/30	10.1.208.121 – 10.1.208.122	10.1.208.123
32	10.1.208.124/30	10.1.208.125 – 10.1.208.126	10.1.208.127
33	10.1.208.128/30	10.1.208.129 – 10.1.208.130	10.1.208.131
34	10.1.208.132/30	10.1.208.133 – 10.1.208.134	10.1.208.135
35	10.1.208.136/30	10.1.208.137 – 10.1.208.138	10.1.208.139
36	10.1.208.140/30	10.1.208.141 – 10.1.208.142	10.1.208.143
37	10.1.208.144/30	10.1.208.145 – 10.1.208.146	10.1.208.147
38	10.1.208.148/30	10.1.208.149 – 10.1.208.150	10.1.208.151
39	10.1.208.152/30	10.1.208.153 – 10.1.208.154	10.1.208.155
40	10.1.208.156/30	10.1.208.157 – 10.1.208.158	10.1.208.159
41	10.1.208.160/30	10.1.208.161 – 10.1.208.162	10.1.208.163
42	10.1.208.164/30	10.1.208.165 – 10.1.208.166	10.1.208.167
43	10.1.208.168/30	10.1.208.169 – 10.1.208.170	10.1.208.171
44	10.1.208.172/30	10.1.208.173 – 10.1.208.174	10.1.208.175
45	10.1.208.176/30	10.1.208.177 – 10.1.208.178	10.1.208.179
46	10.1.208.180/30	10.1.208.181 – 10.1.208.182	10.1.208.183
47	10.1.208.184/30	10.1.208.185 – 10.1.208.186	10.1.208.187
48	10.1.208.188/30	10.1.208.189 – 10.1.208.190	10.1.208.191
49	10.1.208.192/30	10.1.208.193 – 10.1.208.194	10.1.208.195
50	10.1.208.196/30	10.1.208.197 – 10.1.208.198	10.1.208.199
51	10.1.208.200/30	10.1.208.201 – 10.1.208.202	10.1.208.203
52	10.1.208.204/30	10.1.208.205 – 10.1.208.206	10.1.208.207
53	10.1.208.208/30	10.1.208.209 – 10.1.208.210	10.1.208.211
54	10.1.208.212/30	10.1.208.213 – 10.1.208.214	10.1.208.215
55	10.1.208.216/30	10.1.208.217 – 10.1.208.218	10.1.208.219
56	10.1.208.220/30	10.1.208.221 – 10.1.208.222	10.1.208.223
57	10.1.208.224/30	10.1.208.225 – 10.1.208.226	10.1.208.227
58	10.1.208.228/30	10.1.208.229 – 10.1.208.230	10.1.208.231
59	10.1.208.232/30	10.1.208.233 – 10.1.208.234	10.1.208.235
60	10.1.208.236/30	10.1.208.237 – 10.1.208.238	10.1.208.239
61	10.1.208.240/30	10.1.208.241 – 10.1.208.242	10.1.208.243
62	10.1.208.244/30	10.1.208.245 – 10.1.208.246	10.1.208.247
63	10.1.208.248/30	10.1.208.249 – 10.1.208.250	10.1.208.251
64	10.1.208.252/30	10.1.208.253 – 10.1.208.254	10.1.208.255
65	10.1.209.0/30	10.1.209.1 – 10.1.209.2	10.1.209.3
66	10.1.209.4/30	10.1.209.5 – 10.1.209.6	10.1.209.7
67	10.1.209.8/30	10.1.209.9 – 10.1.209.10	10.1.209.11
68	10.1.209.12/30	10.1.209.13 – 10.1.209.14	10.1.209.15
69	10.1.209.16/30	10.1.209.17 – 10.1.209.18	10.1.209.19
70	10.1.209.20/30	10.1.209.21 – 10.1.209.22	10.1.209.23
71	10.1.209.24/30	10.1.209.25 – 10.1.209.26	10.1.209.27
72	10.1.209.28/30	10.1.209.29 – 10.1.209.30	10.1.209.31
73	10.1.209.32/30	10.1.209.33 – 10.1.209.34	10.1.209.35
74	10.1.209.36/30	10.1.209.37 – 10.1.209.38	10.1.209.39
75	10.1.209.40/30	10.1.209.41 – 10.1.209.42	10.1.209.43
76	10.1.209.44/30	10.1.209.45 – 10.1.209.46	10.1.209.47
77	10.1.209.48/30	10.1.209.49 – 10.1.209.50	10.1.209.51
78	10.1.209.52/30	10.1.209.53 – 10.1.209.54	10.1.209.55
79	10.1.209.56/30	10.1.209.57 – 10.1.209.58	10.1.209.59
80	10.1.209.60/30	10.1.209.61 – 10.1.209.62	10.1.209.63
81	10.1.209.64/30	10.1.209.65 – 10.1.209.66	10.1.209.67
82	10.1.209.68/30	10.1.209.69 – 10.1.209.70	10.1.209.71
83	10.1.209.72/30	10.1.209.73 – 10.1.209.74	10.1.209.75
84	10.1.209.76/30	10.1.209.77 – 10.1.209.78	10.1.209.79
85	10.1.209.80/30	10.1.209.81 – 10.1.209.82	10.1.209.83
86	10.1.209.84/30	10.1.209.85 – 10.1.209.86	10.1.209.87
87	10.1.209.88/30	10.1.209.89 – 10.1.209.90	10.1.209.91
88	10.1.209.92/30	10.1.209.93 – 10.1.209.94	10.1.209.95
89	10.1.209.96/30	10.1.209.97 – 10.1.209.98	10.1.209.99
90	10.1.209.100/30	10.1.209.101 – 10.1.209.102	10.1.209.103
91	10.1.209.104/30	10.1.209.105 – 10.1.209.106	10.1.209.107
92	10.1.209.108/30	10.1.209.109 – 10.1.209.110	10.1.209.111
93	10.1.209.112/30	10.1.209.113 – 10.1.209.114	10.1.209.115
94	10.1.209.116/30	10.1.209.117 – 10.1.209.118	10.1.209.119
95	10.1.209.120/30	10.1.209.121 – 10.1.209.122	10.1.209.123
96	10.1.209.124/30	10.1.209.125 – 10.1.209.126	10.1.209.127
97	10.1.209.128/30	10.1.209.129 – 10.1.209.130	10.1.209.131
98	10.1.209.132/30	10.1.209.133 – 10.1.209.134	10.1.209.135
99	10.1.209.136/30	10.1.209.137 – 10.1.209.138	10.1.209.139
100	10.1.209.140/30	10.1.209.141 – 10.1.209.142	10.1.209.143
101	10.1.209.144/30	10.1.209.145 – 10.1.209.146	10.1.209.147
102	10.1.209.148/30	10.1.209.149 – 10.1.209.150	10.1.209.151
103	10.1.209.152/30	10.1.209.153 – 10.1.209.154	10.1.209.155
104	10.1.209.156/30	10.1.209.157 – 10.1.209.158	10.1.209.159
105	10.1.209.160/30	10.1.209.161 – 10.1.209.162	10.1.209.163
106	10.1.209.164/30	10.1.209.165 – 10.1.209.166	10.1.209.167
107	10.1.209.168/30	10.1.209.169 – 10.1.209.170	10.1.209.171
108	10.1.209.172/30	10.1.209.173 – 10.1.209.174	10.1.209.175
109	10.1.209.176/30	10.1.209.177 – 10.1.209.178	10.1.209.179
110	10.1.209.180/30	10.1.209.181 – 10.1.209.182	10.1.209.183
111	10.1.209.184/30	10.1.209.185 – 10.1.209.186	10.1.209.187
112	10.1.209.188/30	10.1.209.189 – 10.1.209.190	10.1.209.191
113	10.1.209.192/30	10.1.209.193 – 10.1.209.194	10.1.209.195
114	10.1.209.196/30	10.1.209.197 – 10.1.209.198	10.1.209.199
115	10.1.209.200/30	10.1.209.201 – 10.1.209.202	10.1.209.203
116	10.1.209.204/30	10.1.209.205 – 10.1.209.206	10.1.209.207
117	10.1.209.208/30	10.1.209.209 – 10.1.209.210	10.1.209.211
118	10.1.209.212/30	10.1.209.213 – 10.1.209.214	10.1.209.215
119	10.1.209.216/30	10.1.209.217 – 10.1.209.218	10.1.209.219
120	10.1.209.220/30	10.1.209.221 – 10.1.209.222	10.1.209.223
121	10.1.209.224/30	10.1.209.225 – 10.1.209.226	10.1.209.227
122	10.1.209.228/30	10.1.209.229 – 10.1.209.230	10.1.209.231
123	10.1.209.232/30	10.1.209.233 – 10.1.209.234	10.1.209.235
124	10.1.209.236/30	10.1.209.237 – 10.1.209.238	10.1.209.239
125	10.1.209.240/30	10.1.209.241 – 10.1.209.242	10.1.209.243
126	10.1.209.244/30	10.1.209.245 – 10.1.209.246	10.1.209.247
127	10.1.209.248/30	10.1.209.249 – 10.1.209.250	10.1.209.251
128	10.1.209.252/30	10.1.209.253 – 10.1.209.254	10.1.209.255

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 →