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)10.3.68.0/23

network10.3.68.0/23

broadcast10.3.69.255

first host10.3.68.1

last host10.3.69.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.3.68.0/23

address00001010.00000011.01000100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000011.01000100.00000000

broadcast00001010.00000011.01000101.11111111

green = network part, grey = host part

hex0x0a034400

decimal167986176

reverse dns0.68.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:4400

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.68.0/30	10.3.68.1 – 10.3.68.2	10.3.68.3
2	10.3.68.4/30	10.3.68.5 – 10.3.68.6	10.3.68.7
3	10.3.68.8/30	10.3.68.9 – 10.3.68.10	10.3.68.11
4	10.3.68.12/30	10.3.68.13 – 10.3.68.14	10.3.68.15
5	10.3.68.16/30	10.3.68.17 – 10.3.68.18	10.3.68.19
6	10.3.68.20/30	10.3.68.21 – 10.3.68.22	10.3.68.23
7	10.3.68.24/30	10.3.68.25 – 10.3.68.26	10.3.68.27
8	10.3.68.28/30	10.3.68.29 – 10.3.68.30	10.3.68.31
9	10.3.68.32/30	10.3.68.33 – 10.3.68.34	10.3.68.35
10	10.3.68.36/30	10.3.68.37 – 10.3.68.38	10.3.68.39
11	10.3.68.40/30	10.3.68.41 – 10.3.68.42	10.3.68.43
12	10.3.68.44/30	10.3.68.45 – 10.3.68.46	10.3.68.47
13	10.3.68.48/30	10.3.68.49 – 10.3.68.50	10.3.68.51
14	10.3.68.52/30	10.3.68.53 – 10.3.68.54	10.3.68.55
15	10.3.68.56/30	10.3.68.57 – 10.3.68.58	10.3.68.59
16	10.3.68.60/30	10.3.68.61 – 10.3.68.62	10.3.68.63
17	10.3.68.64/30	10.3.68.65 – 10.3.68.66	10.3.68.67
18	10.3.68.68/30	10.3.68.69 – 10.3.68.70	10.3.68.71
19	10.3.68.72/30	10.3.68.73 – 10.3.68.74	10.3.68.75
20	10.3.68.76/30	10.3.68.77 – 10.3.68.78	10.3.68.79
21	10.3.68.80/30	10.3.68.81 – 10.3.68.82	10.3.68.83
22	10.3.68.84/30	10.3.68.85 – 10.3.68.86	10.3.68.87
23	10.3.68.88/30	10.3.68.89 – 10.3.68.90	10.3.68.91
24	10.3.68.92/30	10.3.68.93 – 10.3.68.94	10.3.68.95
25	10.3.68.96/30	10.3.68.97 – 10.3.68.98	10.3.68.99
26	10.3.68.100/30	10.3.68.101 – 10.3.68.102	10.3.68.103
27	10.3.68.104/30	10.3.68.105 – 10.3.68.106	10.3.68.107
28	10.3.68.108/30	10.3.68.109 – 10.3.68.110	10.3.68.111
29	10.3.68.112/30	10.3.68.113 – 10.3.68.114	10.3.68.115
30	10.3.68.116/30	10.3.68.117 – 10.3.68.118	10.3.68.119
31	10.3.68.120/30	10.3.68.121 – 10.3.68.122	10.3.68.123
32	10.3.68.124/30	10.3.68.125 – 10.3.68.126	10.3.68.127
33	10.3.68.128/30	10.3.68.129 – 10.3.68.130	10.3.68.131
34	10.3.68.132/30	10.3.68.133 – 10.3.68.134	10.3.68.135
35	10.3.68.136/30	10.3.68.137 – 10.3.68.138	10.3.68.139
36	10.3.68.140/30	10.3.68.141 – 10.3.68.142	10.3.68.143
37	10.3.68.144/30	10.3.68.145 – 10.3.68.146	10.3.68.147
38	10.3.68.148/30	10.3.68.149 – 10.3.68.150	10.3.68.151
39	10.3.68.152/30	10.3.68.153 – 10.3.68.154	10.3.68.155
40	10.3.68.156/30	10.3.68.157 – 10.3.68.158	10.3.68.159
41	10.3.68.160/30	10.3.68.161 – 10.3.68.162	10.3.68.163
42	10.3.68.164/30	10.3.68.165 – 10.3.68.166	10.3.68.167
43	10.3.68.168/30	10.3.68.169 – 10.3.68.170	10.3.68.171
44	10.3.68.172/30	10.3.68.173 – 10.3.68.174	10.3.68.175
45	10.3.68.176/30	10.3.68.177 – 10.3.68.178	10.3.68.179
46	10.3.68.180/30	10.3.68.181 – 10.3.68.182	10.3.68.183
47	10.3.68.184/30	10.3.68.185 – 10.3.68.186	10.3.68.187
48	10.3.68.188/30	10.3.68.189 – 10.3.68.190	10.3.68.191
49	10.3.68.192/30	10.3.68.193 – 10.3.68.194	10.3.68.195
50	10.3.68.196/30	10.3.68.197 – 10.3.68.198	10.3.68.199
51	10.3.68.200/30	10.3.68.201 – 10.3.68.202	10.3.68.203
52	10.3.68.204/30	10.3.68.205 – 10.3.68.206	10.3.68.207
53	10.3.68.208/30	10.3.68.209 – 10.3.68.210	10.3.68.211
54	10.3.68.212/30	10.3.68.213 – 10.3.68.214	10.3.68.215
55	10.3.68.216/30	10.3.68.217 – 10.3.68.218	10.3.68.219
56	10.3.68.220/30	10.3.68.221 – 10.3.68.222	10.3.68.223
57	10.3.68.224/30	10.3.68.225 – 10.3.68.226	10.3.68.227
58	10.3.68.228/30	10.3.68.229 – 10.3.68.230	10.3.68.231
59	10.3.68.232/30	10.3.68.233 – 10.3.68.234	10.3.68.235
60	10.3.68.236/30	10.3.68.237 – 10.3.68.238	10.3.68.239
61	10.3.68.240/30	10.3.68.241 – 10.3.68.242	10.3.68.243
62	10.3.68.244/30	10.3.68.245 – 10.3.68.246	10.3.68.247
63	10.3.68.248/30	10.3.68.249 – 10.3.68.250	10.3.68.251
64	10.3.68.252/30	10.3.68.253 – 10.3.68.254	10.3.68.255
65	10.3.69.0/30	10.3.69.1 – 10.3.69.2	10.3.69.3
66	10.3.69.4/30	10.3.69.5 – 10.3.69.6	10.3.69.7
67	10.3.69.8/30	10.3.69.9 – 10.3.69.10	10.3.69.11
68	10.3.69.12/30	10.3.69.13 – 10.3.69.14	10.3.69.15
69	10.3.69.16/30	10.3.69.17 – 10.3.69.18	10.3.69.19
70	10.3.69.20/30	10.3.69.21 – 10.3.69.22	10.3.69.23
71	10.3.69.24/30	10.3.69.25 – 10.3.69.26	10.3.69.27
72	10.3.69.28/30	10.3.69.29 – 10.3.69.30	10.3.69.31
73	10.3.69.32/30	10.3.69.33 – 10.3.69.34	10.3.69.35
74	10.3.69.36/30	10.3.69.37 – 10.3.69.38	10.3.69.39
75	10.3.69.40/30	10.3.69.41 – 10.3.69.42	10.3.69.43
76	10.3.69.44/30	10.3.69.45 – 10.3.69.46	10.3.69.47
77	10.3.69.48/30	10.3.69.49 – 10.3.69.50	10.3.69.51
78	10.3.69.52/30	10.3.69.53 – 10.3.69.54	10.3.69.55
79	10.3.69.56/30	10.3.69.57 – 10.3.69.58	10.3.69.59
80	10.3.69.60/30	10.3.69.61 – 10.3.69.62	10.3.69.63
81	10.3.69.64/30	10.3.69.65 – 10.3.69.66	10.3.69.67
82	10.3.69.68/30	10.3.69.69 – 10.3.69.70	10.3.69.71
83	10.3.69.72/30	10.3.69.73 – 10.3.69.74	10.3.69.75
84	10.3.69.76/30	10.3.69.77 – 10.3.69.78	10.3.69.79
85	10.3.69.80/30	10.3.69.81 – 10.3.69.82	10.3.69.83
86	10.3.69.84/30	10.3.69.85 – 10.3.69.86	10.3.69.87
87	10.3.69.88/30	10.3.69.89 – 10.3.69.90	10.3.69.91
88	10.3.69.92/30	10.3.69.93 – 10.3.69.94	10.3.69.95
89	10.3.69.96/30	10.3.69.97 – 10.3.69.98	10.3.69.99
90	10.3.69.100/30	10.3.69.101 – 10.3.69.102	10.3.69.103
91	10.3.69.104/30	10.3.69.105 – 10.3.69.106	10.3.69.107
92	10.3.69.108/30	10.3.69.109 – 10.3.69.110	10.3.69.111
93	10.3.69.112/30	10.3.69.113 – 10.3.69.114	10.3.69.115
94	10.3.69.116/30	10.3.69.117 – 10.3.69.118	10.3.69.119
95	10.3.69.120/30	10.3.69.121 – 10.3.69.122	10.3.69.123
96	10.3.69.124/30	10.3.69.125 – 10.3.69.126	10.3.69.127
97	10.3.69.128/30	10.3.69.129 – 10.3.69.130	10.3.69.131
98	10.3.69.132/30	10.3.69.133 – 10.3.69.134	10.3.69.135
99	10.3.69.136/30	10.3.69.137 – 10.3.69.138	10.3.69.139
100	10.3.69.140/30	10.3.69.141 – 10.3.69.142	10.3.69.143
101	10.3.69.144/30	10.3.69.145 – 10.3.69.146	10.3.69.147
102	10.3.69.148/30	10.3.69.149 – 10.3.69.150	10.3.69.151
103	10.3.69.152/30	10.3.69.153 – 10.3.69.154	10.3.69.155
104	10.3.69.156/30	10.3.69.157 – 10.3.69.158	10.3.69.159
105	10.3.69.160/30	10.3.69.161 – 10.3.69.162	10.3.69.163
106	10.3.69.164/30	10.3.69.165 – 10.3.69.166	10.3.69.167
107	10.3.69.168/30	10.3.69.169 – 10.3.69.170	10.3.69.171
108	10.3.69.172/30	10.3.69.173 – 10.3.69.174	10.3.69.175
109	10.3.69.176/30	10.3.69.177 – 10.3.69.178	10.3.69.179
110	10.3.69.180/30	10.3.69.181 – 10.3.69.182	10.3.69.183
111	10.3.69.184/30	10.3.69.185 – 10.3.69.186	10.3.69.187
112	10.3.69.188/30	10.3.69.189 – 10.3.69.190	10.3.69.191
113	10.3.69.192/30	10.3.69.193 – 10.3.69.194	10.3.69.195
114	10.3.69.196/30	10.3.69.197 – 10.3.69.198	10.3.69.199
115	10.3.69.200/30	10.3.69.201 – 10.3.69.202	10.3.69.203
116	10.3.69.204/30	10.3.69.205 – 10.3.69.206	10.3.69.207
117	10.3.69.208/30	10.3.69.209 – 10.3.69.210	10.3.69.211
118	10.3.69.212/30	10.3.69.213 – 10.3.69.214	10.3.69.215
119	10.3.69.216/30	10.3.69.217 – 10.3.69.218	10.3.69.219
120	10.3.69.220/30	10.3.69.221 – 10.3.69.222	10.3.69.223
121	10.3.69.224/30	10.3.69.225 – 10.3.69.226	10.3.69.227
122	10.3.69.228/30	10.3.69.229 – 10.3.69.230	10.3.69.231
123	10.3.69.232/30	10.3.69.233 – 10.3.69.234	10.3.69.235
124	10.3.69.236/30	10.3.69.237 – 10.3.69.238	10.3.69.239
125	10.3.69.240/30	10.3.69.241 – 10.3.69.242	10.3.69.243
126	10.3.69.244/30	10.3.69.245 – 10.3.69.246	10.3.69.247
127	10.3.69.248/30	10.3.69.249 – 10.3.69.250	10.3.69.251
128	10.3.69.252/30	10.3.69.253 – 10.3.69.254	10.3.69.255

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 →