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)10.2.168.0/23

network10.2.168.0/23

broadcast10.2.169.255

first host10.2.168.1

last host10.2.169.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.168.0/23

address00001010.00000010.10101000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.10101000.00000000

broadcast00001010.00000010.10101001.11111111

green = network part, grey = host part

hex0x0a02a800

decimal167946240

reverse dns0.168.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:a800

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.168.0/30	10.2.168.1 – 10.2.168.2	10.2.168.3
2	10.2.168.4/30	10.2.168.5 – 10.2.168.6	10.2.168.7
3	10.2.168.8/30	10.2.168.9 – 10.2.168.10	10.2.168.11
4	10.2.168.12/30	10.2.168.13 – 10.2.168.14	10.2.168.15
5	10.2.168.16/30	10.2.168.17 – 10.2.168.18	10.2.168.19
6	10.2.168.20/30	10.2.168.21 – 10.2.168.22	10.2.168.23
7	10.2.168.24/30	10.2.168.25 – 10.2.168.26	10.2.168.27
8	10.2.168.28/30	10.2.168.29 – 10.2.168.30	10.2.168.31
9	10.2.168.32/30	10.2.168.33 – 10.2.168.34	10.2.168.35
10	10.2.168.36/30	10.2.168.37 – 10.2.168.38	10.2.168.39
11	10.2.168.40/30	10.2.168.41 – 10.2.168.42	10.2.168.43
12	10.2.168.44/30	10.2.168.45 – 10.2.168.46	10.2.168.47
13	10.2.168.48/30	10.2.168.49 – 10.2.168.50	10.2.168.51
14	10.2.168.52/30	10.2.168.53 – 10.2.168.54	10.2.168.55
15	10.2.168.56/30	10.2.168.57 – 10.2.168.58	10.2.168.59
16	10.2.168.60/30	10.2.168.61 – 10.2.168.62	10.2.168.63
17	10.2.168.64/30	10.2.168.65 – 10.2.168.66	10.2.168.67
18	10.2.168.68/30	10.2.168.69 – 10.2.168.70	10.2.168.71
19	10.2.168.72/30	10.2.168.73 – 10.2.168.74	10.2.168.75
20	10.2.168.76/30	10.2.168.77 – 10.2.168.78	10.2.168.79
21	10.2.168.80/30	10.2.168.81 – 10.2.168.82	10.2.168.83
22	10.2.168.84/30	10.2.168.85 – 10.2.168.86	10.2.168.87
23	10.2.168.88/30	10.2.168.89 – 10.2.168.90	10.2.168.91
24	10.2.168.92/30	10.2.168.93 – 10.2.168.94	10.2.168.95
25	10.2.168.96/30	10.2.168.97 – 10.2.168.98	10.2.168.99
26	10.2.168.100/30	10.2.168.101 – 10.2.168.102	10.2.168.103
27	10.2.168.104/30	10.2.168.105 – 10.2.168.106	10.2.168.107
28	10.2.168.108/30	10.2.168.109 – 10.2.168.110	10.2.168.111
29	10.2.168.112/30	10.2.168.113 – 10.2.168.114	10.2.168.115
30	10.2.168.116/30	10.2.168.117 – 10.2.168.118	10.2.168.119
31	10.2.168.120/30	10.2.168.121 – 10.2.168.122	10.2.168.123
32	10.2.168.124/30	10.2.168.125 – 10.2.168.126	10.2.168.127
33	10.2.168.128/30	10.2.168.129 – 10.2.168.130	10.2.168.131
34	10.2.168.132/30	10.2.168.133 – 10.2.168.134	10.2.168.135
35	10.2.168.136/30	10.2.168.137 – 10.2.168.138	10.2.168.139
36	10.2.168.140/30	10.2.168.141 – 10.2.168.142	10.2.168.143
37	10.2.168.144/30	10.2.168.145 – 10.2.168.146	10.2.168.147
38	10.2.168.148/30	10.2.168.149 – 10.2.168.150	10.2.168.151
39	10.2.168.152/30	10.2.168.153 – 10.2.168.154	10.2.168.155
40	10.2.168.156/30	10.2.168.157 – 10.2.168.158	10.2.168.159
41	10.2.168.160/30	10.2.168.161 – 10.2.168.162	10.2.168.163
42	10.2.168.164/30	10.2.168.165 – 10.2.168.166	10.2.168.167
43	10.2.168.168/30	10.2.168.169 – 10.2.168.170	10.2.168.171
44	10.2.168.172/30	10.2.168.173 – 10.2.168.174	10.2.168.175
45	10.2.168.176/30	10.2.168.177 – 10.2.168.178	10.2.168.179
46	10.2.168.180/30	10.2.168.181 – 10.2.168.182	10.2.168.183
47	10.2.168.184/30	10.2.168.185 – 10.2.168.186	10.2.168.187
48	10.2.168.188/30	10.2.168.189 – 10.2.168.190	10.2.168.191
49	10.2.168.192/30	10.2.168.193 – 10.2.168.194	10.2.168.195
50	10.2.168.196/30	10.2.168.197 – 10.2.168.198	10.2.168.199
51	10.2.168.200/30	10.2.168.201 – 10.2.168.202	10.2.168.203
52	10.2.168.204/30	10.2.168.205 – 10.2.168.206	10.2.168.207
53	10.2.168.208/30	10.2.168.209 – 10.2.168.210	10.2.168.211
54	10.2.168.212/30	10.2.168.213 – 10.2.168.214	10.2.168.215
55	10.2.168.216/30	10.2.168.217 – 10.2.168.218	10.2.168.219
56	10.2.168.220/30	10.2.168.221 – 10.2.168.222	10.2.168.223
57	10.2.168.224/30	10.2.168.225 – 10.2.168.226	10.2.168.227
58	10.2.168.228/30	10.2.168.229 – 10.2.168.230	10.2.168.231
59	10.2.168.232/30	10.2.168.233 – 10.2.168.234	10.2.168.235
60	10.2.168.236/30	10.2.168.237 – 10.2.168.238	10.2.168.239
61	10.2.168.240/30	10.2.168.241 – 10.2.168.242	10.2.168.243
62	10.2.168.244/30	10.2.168.245 – 10.2.168.246	10.2.168.247
63	10.2.168.248/30	10.2.168.249 – 10.2.168.250	10.2.168.251
64	10.2.168.252/30	10.2.168.253 – 10.2.168.254	10.2.168.255
65	10.2.169.0/30	10.2.169.1 – 10.2.169.2	10.2.169.3
66	10.2.169.4/30	10.2.169.5 – 10.2.169.6	10.2.169.7
67	10.2.169.8/30	10.2.169.9 – 10.2.169.10	10.2.169.11
68	10.2.169.12/30	10.2.169.13 – 10.2.169.14	10.2.169.15
69	10.2.169.16/30	10.2.169.17 – 10.2.169.18	10.2.169.19
70	10.2.169.20/30	10.2.169.21 – 10.2.169.22	10.2.169.23
71	10.2.169.24/30	10.2.169.25 – 10.2.169.26	10.2.169.27
72	10.2.169.28/30	10.2.169.29 – 10.2.169.30	10.2.169.31
73	10.2.169.32/30	10.2.169.33 – 10.2.169.34	10.2.169.35
74	10.2.169.36/30	10.2.169.37 – 10.2.169.38	10.2.169.39
75	10.2.169.40/30	10.2.169.41 – 10.2.169.42	10.2.169.43
76	10.2.169.44/30	10.2.169.45 – 10.2.169.46	10.2.169.47
77	10.2.169.48/30	10.2.169.49 – 10.2.169.50	10.2.169.51
78	10.2.169.52/30	10.2.169.53 – 10.2.169.54	10.2.169.55
79	10.2.169.56/30	10.2.169.57 – 10.2.169.58	10.2.169.59
80	10.2.169.60/30	10.2.169.61 – 10.2.169.62	10.2.169.63
81	10.2.169.64/30	10.2.169.65 – 10.2.169.66	10.2.169.67
82	10.2.169.68/30	10.2.169.69 – 10.2.169.70	10.2.169.71
83	10.2.169.72/30	10.2.169.73 – 10.2.169.74	10.2.169.75
84	10.2.169.76/30	10.2.169.77 – 10.2.169.78	10.2.169.79
85	10.2.169.80/30	10.2.169.81 – 10.2.169.82	10.2.169.83
86	10.2.169.84/30	10.2.169.85 – 10.2.169.86	10.2.169.87
87	10.2.169.88/30	10.2.169.89 – 10.2.169.90	10.2.169.91
88	10.2.169.92/30	10.2.169.93 – 10.2.169.94	10.2.169.95
89	10.2.169.96/30	10.2.169.97 – 10.2.169.98	10.2.169.99
90	10.2.169.100/30	10.2.169.101 – 10.2.169.102	10.2.169.103
91	10.2.169.104/30	10.2.169.105 – 10.2.169.106	10.2.169.107
92	10.2.169.108/30	10.2.169.109 – 10.2.169.110	10.2.169.111
93	10.2.169.112/30	10.2.169.113 – 10.2.169.114	10.2.169.115
94	10.2.169.116/30	10.2.169.117 – 10.2.169.118	10.2.169.119
95	10.2.169.120/30	10.2.169.121 – 10.2.169.122	10.2.169.123
96	10.2.169.124/30	10.2.169.125 – 10.2.169.126	10.2.169.127
97	10.2.169.128/30	10.2.169.129 – 10.2.169.130	10.2.169.131
98	10.2.169.132/30	10.2.169.133 – 10.2.169.134	10.2.169.135
99	10.2.169.136/30	10.2.169.137 – 10.2.169.138	10.2.169.139
100	10.2.169.140/30	10.2.169.141 – 10.2.169.142	10.2.169.143
101	10.2.169.144/30	10.2.169.145 – 10.2.169.146	10.2.169.147
102	10.2.169.148/30	10.2.169.149 – 10.2.169.150	10.2.169.151
103	10.2.169.152/30	10.2.169.153 – 10.2.169.154	10.2.169.155
104	10.2.169.156/30	10.2.169.157 – 10.2.169.158	10.2.169.159
105	10.2.169.160/30	10.2.169.161 – 10.2.169.162	10.2.169.163
106	10.2.169.164/30	10.2.169.165 – 10.2.169.166	10.2.169.167
107	10.2.169.168/30	10.2.169.169 – 10.2.169.170	10.2.169.171
108	10.2.169.172/30	10.2.169.173 – 10.2.169.174	10.2.169.175
109	10.2.169.176/30	10.2.169.177 – 10.2.169.178	10.2.169.179
110	10.2.169.180/30	10.2.169.181 – 10.2.169.182	10.2.169.183
111	10.2.169.184/30	10.2.169.185 – 10.2.169.186	10.2.169.187
112	10.2.169.188/30	10.2.169.189 – 10.2.169.190	10.2.169.191
113	10.2.169.192/30	10.2.169.193 – 10.2.169.194	10.2.169.195
114	10.2.169.196/30	10.2.169.197 – 10.2.169.198	10.2.169.199
115	10.2.169.200/30	10.2.169.201 – 10.2.169.202	10.2.169.203
116	10.2.169.204/30	10.2.169.205 – 10.2.169.206	10.2.169.207
117	10.2.169.208/30	10.2.169.209 – 10.2.169.210	10.2.169.211
118	10.2.169.212/30	10.2.169.213 – 10.2.169.214	10.2.169.215
119	10.2.169.216/30	10.2.169.217 – 10.2.169.218	10.2.169.219
120	10.2.169.220/30	10.2.169.221 – 10.2.169.222	10.2.169.223
121	10.2.169.224/30	10.2.169.225 – 10.2.169.226	10.2.169.227
122	10.2.169.228/30	10.2.169.229 – 10.2.169.230	10.2.169.231
123	10.2.169.232/30	10.2.169.233 – 10.2.169.234	10.2.169.235
124	10.2.169.236/30	10.2.169.237 – 10.2.169.238	10.2.169.239
125	10.2.169.240/30	10.2.169.241 – 10.2.169.242	10.2.169.243
126	10.2.169.244/30	10.2.169.245 – 10.2.169.246	10.2.169.247
127	10.2.169.248/30	10.2.169.249 – 10.2.169.250	10.2.169.251
128	10.2.169.252/30	10.2.169.253 – 10.2.169.254	10.2.169.255

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 →