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)10.4.104.0/23

network10.4.104.0/23

broadcast10.4.105.255

first host10.4.104.1

last host10.4.105.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.4.104.0/23

address00001010.00000100.01101000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000100.01101000.00000000

broadcast00001010.00000100.01101001.11111111

green = network part, grey = host part

hex0x0a046800

decimal168060928

reverse dns0.104.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:6800

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.4.104.0/30	10.4.104.1 – 10.4.104.2	10.4.104.3
2	10.4.104.4/30	10.4.104.5 – 10.4.104.6	10.4.104.7
3	10.4.104.8/30	10.4.104.9 – 10.4.104.10	10.4.104.11
4	10.4.104.12/30	10.4.104.13 – 10.4.104.14	10.4.104.15
5	10.4.104.16/30	10.4.104.17 – 10.4.104.18	10.4.104.19
6	10.4.104.20/30	10.4.104.21 – 10.4.104.22	10.4.104.23
7	10.4.104.24/30	10.4.104.25 – 10.4.104.26	10.4.104.27
8	10.4.104.28/30	10.4.104.29 – 10.4.104.30	10.4.104.31
9	10.4.104.32/30	10.4.104.33 – 10.4.104.34	10.4.104.35
10	10.4.104.36/30	10.4.104.37 – 10.4.104.38	10.4.104.39
11	10.4.104.40/30	10.4.104.41 – 10.4.104.42	10.4.104.43
12	10.4.104.44/30	10.4.104.45 – 10.4.104.46	10.4.104.47
13	10.4.104.48/30	10.4.104.49 – 10.4.104.50	10.4.104.51
14	10.4.104.52/30	10.4.104.53 – 10.4.104.54	10.4.104.55
15	10.4.104.56/30	10.4.104.57 – 10.4.104.58	10.4.104.59
16	10.4.104.60/30	10.4.104.61 – 10.4.104.62	10.4.104.63
17	10.4.104.64/30	10.4.104.65 – 10.4.104.66	10.4.104.67
18	10.4.104.68/30	10.4.104.69 – 10.4.104.70	10.4.104.71
19	10.4.104.72/30	10.4.104.73 – 10.4.104.74	10.4.104.75
20	10.4.104.76/30	10.4.104.77 – 10.4.104.78	10.4.104.79
21	10.4.104.80/30	10.4.104.81 – 10.4.104.82	10.4.104.83
22	10.4.104.84/30	10.4.104.85 – 10.4.104.86	10.4.104.87
23	10.4.104.88/30	10.4.104.89 – 10.4.104.90	10.4.104.91
24	10.4.104.92/30	10.4.104.93 – 10.4.104.94	10.4.104.95
25	10.4.104.96/30	10.4.104.97 – 10.4.104.98	10.4.104.99
26	10.4.104.100/30	10.4.104.101 – 10.4.104.102	10.4.104.103
27	10.4.104.104/30	10.4.104.105 – 10.4.104.106	10.4.104.107
28	10.4.104.108/30	10.4.104.109 – 10.4.104.110	10.4.104.111
29	10.4.104.112/30	10.4.104.113 – 10.4.104.114	10.4.104.115
30	10.4.104.116/30	10.4.104.117 – 10.4.104.118	10.4.104.119
31	10.4.104.120/30	10.4.104.121 – 10.4.104.122	10.4.104.123
32	10.4.104.124/30	10.4.104.125 – 10.4.104.126	10.4.104.127
33	10.4.104.128/30	10.4.104.129 – 10.4.104.130	10.4.104.131
34	10.4.104.132/30	10.4.104.133 – 10.4.104.134	10.4.104.135
35	10.4.104.136/30	10.4.104.137 – 10.4.104.138	10.4.104.139
36	10.4.104.140/30	10.4.104.141 – 10.4.104.142	10.4.104.143
37	10.4.104.144/30	10.4.104.145 – 10.4.104.146	10.4.104.147
38	10.4.104.148/30	10.4.104.149 – 10.4.104.150	10.4.104.151
39	10.4.104.152/30	10.4.104.153 – 10.4.104.154	10.4.104.155
40	10.4.104.156/30	10.4.104.157 – 10.4.104.158	10.4.104.159
41	10.4.104.160/30	10.4.104.161 – 10.4.104.162	10.4.104.163
42	10.4.104.164/30	10.4.104.165 – 10.4.104.166	10.4.104.167
43	10.4.104.168/30	10.4.104.169 – 10.4.104.170	10.4.104.171
44	10.4.104.172/30	10.4.104.173 – 10.4.104.174	10.4.104.175
45	10.4.104.176/30	10.4.104.177 – 10.4.104.178	10.4.104.179
46	10.4.104.180/30	10.4.104.181 – 10.4.104.182	10.4.104.183
47	10.4.104.184/30	10.4.104.185 – 10.4.104.186	10.4.104.187
48	10.4.104.188/30	10.4.104.189 – 10.4.104.190	10.4.104.191
49	10.4.104.192/30	10.4.104.193 – 10.4.104.194	10.4.104.195
50	10.4.104.196/30	10.4.104.197 – 10.4.104.198	10.4.104.199
51	10.4.104.200/30	10.4.104.201 – 10.4.104.202	10.4.104.203
52	10.4.104.204/30	10.4.104.205 – 10.4.104.206	10.4.104.207
53	10.4.104.208/30	10.4.104.209 – 10.4.104.210	10.4.104.211
54	10.4.104.212/30	10.4.104.213 – 10.4.104.214	10.4.104.215
55	10.4.104.216/30	10.4.104.217 – 10.4.104.218	10.4.104.219
56	10.4.104.220/30	10.4.104.221 – 10.4.104.222	10.4.104.223
57	10.4.104.224/30	10.4.104.225 – 10.4.104.226	10.4.104.227
58	10.4.104.228/30	10.4.104.229 – 10.4.104.230	10.4.104.231
59	10.4.104.232/30	10.4.104.233 – 10.4.104.234	10.4.104.235
60	10.4.104.236/30	10.4.104.237 – 10.4.104.238	10.4.104.239
61	10.4.104.240/30	10.4.104.241 – 10.4.104.242	10.4.104.243
62	10.4.104.244/30	10.4.104.245 – 10.4.104.246	10.4.104.247
63	10.4.104.248/30	10.4.104.249 – 10.4.104.250	10.4.104.251
64	10.4.104.252/30	10.4.104.253 – 10.4.104.254	10.4.104.255
65	10.4.105.0/30	10.4.105.1 – 10.4.105.2	10.4.105.3
66	10.4.105.4/30	10.4.105.5 – 10.4.105.6	10.4.105.7
67	10.4.105.8/30	10.4.105.9 – 10.4.105.10	10.4.105.11
68	10.4.105.12/30	10.4.105.13 – 10.4.105.14	10.4.105.15
69	10.4.105.16/30	10.4.105.17 – 10.4.105.18	10.4.105.19
70	10.4.105.20/30	10.4.105.21 – 10.4.105.22	10.4.105.23
71	10.4.105.24/30	10.4.105.25 – 10.4.105.26	10.4.105.27
72	10.4.105.28/30	10.4.105.29 – 10.4.105.30	10.4.105.31
73	10.4.105.32/30	10.4.105.33 – 10.4.105.34	10.4.105.35
74	10.4.105.36/30	10.4.105.37 – 10.4.105.38	10.4.105.39
75	10.4.105.40/30	10.4.105.41 – 10.4.105.42	10.4.105.43
76	10.4.105.44/30	10.4.105.45 – 10.4.105.46	10.4.105.47
77	10.4.105.48/30	10.4.105.49 – 10.4.105.50	10.4.105.51
78	10.4.105.52/30	10.4.105.53 – 10.4.105.54	10.4.105.55
79	10.4.105.56/30	10.4.105.57 – 10.4.105.58	10.4.105.59
80	10.4.105.60/30	10.4.105.61 – 10.4.105.62	10.4.105.63
81	10.4.105.64/30	10.4.105.65 – 10.4.105.66	10.4.105.67
82	10.4.105.68/30	10.4.105.69 – 10.4.105.70	10.4.105.71
83	10.4.105.72/30	10.4.105.73 – 10.4.105.74	10.4.105.75
84	10.4.105.76/30	10.4.105.77 – 10.4.105.78	10.4.105.79
85	10.4.105.80/30	10.4.105.81 – 10.4.105.82	10.4.105.83
86	10.4.105.84/30	10.4.105.85 – 10.4.105.86	10.4.105.87
87	10.4.105.88/30	10.4.105.89 – 10.4.105.90	10.4.105.91
88	10.4.105.92/30	10.4.105.93 – 10.4.105.94	10.4.105.95
89	10.4.105.96/30	10.4.105.97 – 10.4.105.98	10.4.105.99
90	10.4.105.100/30	10.4.105.101 – 10.4.105.102	10.4.105.103
91	10.4.105.104/30	10.4.105.105 – 10.4.105.106	10.4.105.107
92	10.4.105.108/30	10.4.105.109 – 10.4.105.110	10.4.105.111
93	10.4.105.112/30	10.4.105.113 – 10.4.105.114	10.4.105.115
94	10.4.105.116/30	10.4.105.117 – 10.4.105.118	10.4.105.119
95	10.4.105.120/30	10.4.105.121 – 10.4.105.122	10.4.105.123
96	10.4.105.124/30	10.4.105.125 – 10.4.105.126	10.4.105.127
97	10.4.105.128/30	10.4.105.129 – 10.4.105.130	10.4.105.131
98	10.4.105.132/30	10.4.105.133 – 10.4.105.134	10.4.105.135
99	10.4.105.136/30	10.4.105.137 – 10.4.105.138	10.4.105.139
100	10.4.105.140/30	10.4.105.141 – 10.4.105.142	10.4.105.143
101	10.4.105.144/30	10.4.105.145 – 10.4.105.146	10.4.105.147
102	10.4.105.148/30	10.4.105.149 – 10.4.105.150	10.4.105.151
103	10.4.105.152/30	10.4.105.153 – 10.4.105.154	10.4.105.155
104	10.4.105.156/30	10.4.105.157 – 10.4.105.158	10.4.105.159
105	10.4.105.160/30	10.4.105.161 – 10.4.105.162	10.4.105.163
106	10.4.105.164/30	10.4.105.165 – 10.4.105.166	10.4.105.167
107	10.4.105.168/30	10.4.105.169 – 10.4.105.170	10.4.105.171
108	10.4.105.172/30	10.4.105.173 – 10.4.105.174	10.4.105.175
109	10.4.105.176/30	10.4.105.177 – 10.4.105.178	10.4.105.179
110	10.4.105.180/30	10.4.105.181 – 10.4.105.182	10.4.105.183
111	10.4.105.184/30	10.4.105.185 – 10.4.105.186	10.4.105.187
112	10.4.105.188/30	10.4.105.189 – 10.4.105.190	10.4.105.191
113	10.4.105.192/30	10.4.105.193 – 10.4.105.194	10.4.105.195
114	10.4.105.196/30	10.4.105.197 – 10.4.105.198	10.4.105.199
115	10.4.105.200/30	10.4.105.201 – 10.4.105.202	10.4.105.203
116	10.4.105.204/30	10.4.105.205 – 10.4.105.206	10.4.105.207
117	10.4.105.208/30	10.4.105.209 – 10.4.105.210	10.4.105.211
118	10.4.105.212/30	10.4.105.213 – 10.4.105.214	10.4.105.215
119	10.4.105.216/30	10.4.105.217 – 10.4.105.218	10.4.105.219
120	10.4.105.220/30	10.4.105.221 – 10.4.105.222	10.4.105.223
121	10.4.105.224/30	10.4.105.225 – 10.4.105.226	10.4.105.227
122	10.4.105.228/30	10.4.105.229 – 10.4.105.230	10.4.105.231
123	10.4.105.232/30	10.4.105.233 – 10.4.105.234	10.4.105.235
124	10.4.105.236/30	10.4.105.237 – 10.4.105.238	10.4.105.239
125	10.4.105.240/30	10.4.105.241 – 10.4.105.242	10.4.105.243
126	10.4.105.244/30	10.4.105.245 – 10.4.105.246	10.4.105.247
127	10.4.105.248/30	10.4.105.249 – 10.4.105.250	10.4.105.251
128	10.4.105.252/30	10.4.105.253 – 10.4.105.254	10.4.105.255

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 →