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)10.4.100.0/23

network10.4.100.0/23

broadcast10.4.101.255

first host10.4.100.1

last host10.4.101.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.4.100.0/23

address00001010.00000100.01100100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000100.01100100.00000000

broadcast00001010.00000100.01100101.11111111

green = network part, grey = host part

hex0x0a046400

decimal168059904

reverse dns0.100.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:6400

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.4.100.0/30	10.4.100.1 – 10.4.100.2	10.4.100.3
2	10.4.100.4/30	10.4.100.5 – 10.4.100.6	10.4.100.7
3	10.4.100.8/30	10.4.100.9 – 10.4.100.10	10.4.100.11
4	10.4.100.12/30	10.4.100.13 – 10.4.100.14	10.4.100.15
5	10.4.100.16/30	10.4.100.17 – 10.4.100.18	10.4.100.19
6	10.4.100.20/30	10.4.100.21 – 10.4.100.22	10.4.100.23
7	10.4.100.24/30	10.4.100.25 – 10.4.100.26	10.4.100.27
8	10.4.100.28/30	10.4.100.29 – 10.4.100.30	10.4.100.31
9	10.4.100.32/30	10.4.100.33 – 10.4.100.34	10.4.100.35
10	10.4.100.36/30	10.4.100.37 – 10.4.100.38	10.4.100.39
11	10.4.100.40/30	10.4.100.41 – 10.4.100.42	10.4.100.43
12	10.4.100.44/30	10.4.100.45 – 10.4.100.46	10.4.100.47
13	10.4.100.48/30	10.4.100.49 – 10.4.100.50	10.4.100.51
14	10.4.100.52/30	10.4.100.53 – 10.4.100.54	10.4.100.55
15	10.4.100.56/30	10.4.100.57 – 10.4.100.58	10.4.100.59
16	10.4.100.60/30	10.4.100.61 – 10.4.100.62	10.4.100.63
17	10.4.100.64/30	10.4.100.65 – 10.4.100.66	10.4.100.67
18	10.4.100.68/30	10.4.100.69 – 10.4.100.70	10.4.100.71
19	10.4.100.72/30	10.4.100.73 – 10.4.100.74	10.4.100.75
20	10.4.100.76/30	10.4.100.77 – 10.4.100.78	10.4.100.79
21	10.4.100.80/30	10.4.100.81 – 10.4.100.82	10.4.100.83
22	10.4.100.84/30	10.4.100.85 – 10.4.100.86	10.4.100.87
23	10.4.100.88/30	10.4.100.89 – 10.4.100.90	10.4.100.91
24	10.4.100.92/30	10.4.100.93 – 10.4.100.94	10.4.100.95
25	10.4.100.96/30	10.4.100.97 – 10.4.100.98	10.4.100.99
26	10.4.100.100/30	10.4.100.101 – 10.4.100.102	10.4.100.103
27	10.4.100.104/30	10.4.100.105 – 10.4.100.106	10.4.100.107
28	10.4.100.108/30	10.4.100.109 – 10.4.100.110	10.4.100.111
29	10.4.100.112/30	10.4.100.113 – 10.4.100.114	10.4.100.115
30	10.4.100.116/30	10.4.100.117 – 10.4.100.118	10.4.100.119
31	10.4.100.120/30	10.4.100.121 – 10.4.100.122	10.4.100.123
32	10.4.100.124/30	10.4.100.125 – 10.4.100.126	10.4.100.127
33	10.4.100.128/30	10.4.100.129 – 10.4.100.130	10.4.100.131
34	10.4.100.132/30	10.4.100.133 – 10.4.100.134	10.4.100.135
35	10.4.100.136/30	10.4.100.137 – 10.4.100.138	10.4.100.139
36	10.4.100.140/30	10.4.100.141 – 10.4.100.142	10.4.100.143
37	10.4.100.144/30	10.4.100.145 – 10.4.100.146	10.4.100.147
38	10.4.100.148/30	10.4.100.149 – 10.4.100.150	10.4.100.151
39	10.4.100.152/30	10.4.100.153 – 10.4.100.154	10.4.100.155
40	10.4.100.156/30	10.4.100.157 – 10.4.100.158	10.4.100.159
41	10.4.100.160/30	10.4.100.161 – 10.4.100.162	10.4.100.163
42	10.4.100.164/30	10.4.100.165 – 10.4.100.166	10.4.100.167
43	10.4.100.168/30	10.4.100.169 – 10.4.100.170	10.4.100.171
44	10.4.100.172/30	10.4.100.173 – 10.4.100.174	10.4.100.175
45	10.4.100.176/30	10.4.100.177 – 10.4.100.178	10.4.100.179
46	10.4.100.180/30	10.4.100.181 – 10.4.100.182	10.4.100.183
47	10.4.100.184/30	10.4.100.185 – 10.4.100.186	10.4.100.187
48	10.4.100.188/30	10.4.100.189 – 10.4.100.190	10.4.100.191
49	10.4.100.192/30	10.4.100.193 – 10.4.100.194	10.4.100.195
50	10.4.100.196/30	10.4.100.197 – 10.4.100.198	10.4.100.199
51	10.4.100.200/30	10.4.100.201 – 10.4.100.202	10.4.100.203
52	10.4.100.204/30	10.4.100.205 – 10.4.100.206	10.4.100.207
53	10.4.100.208/30	10.4.100.209 – 10.4.100.210	10.4.100.211
54	10.4.100.212/30	10.4.100.213 – 10.4.100.214	10.4.100.215
55	10.4.100.216/30	10.4.100.217 – 10.4.100.218	10.4.100.219
56	10.4.100.220/30	10.4.100.221 – 10.4.100.222	10.4.100.223
57	10.4.100.224/30	10.4.100.225 – 10.4.100.226	10.4.100.227
58	10.4.100.228/30	10.4.100.229 – 10.4.100.230	10.4.100.231
59	10.4.100.232/30	10.4.100.233 – 10.4.100.234	10.4.100.235
60	10.4.100.236/30	10.4.100.237 – 10.4.100.238	10.4.100.239
61	10.4.100.240/30	10.4.100.241 – 10.4.100.242	10.4.100.243
62	10.4.100.244/30	10.4.100.245 – 10.4.100.246	10.4.100.247
63	10.4.100.248/30	10.4.100.249 – 10.4.100.250	10.4.100.251
64	10.4.100.252/30	10.4.100.253 – 10.4.100.254	10.4.100.255
65	10.4.101.0/30	10.4.101.1 – 10.4.101.2	10.4.101.3
66	10.4.101.4/30	10.4.101.5 – 10.4.101.6	10.4.101.7
67	10.4.101.8/30	10.4.101.9 – 10.4.101.10	10.4.101.11
68	10.4.101.12/30	10.4.101.13 – 10.4.101.14	10.4.101.15
69	10.4.101.16/30	10.4.101.17 – 10.4.101.18	10.4.101.19
70	10.4.101.20/30	10.4.101.21 – 10.4.101.22	10.4.101.23
71	10.4.101.24/30	10.4.101.25 – 10.4.101.26	10.4.101.27
72	10.4.101.28/30	10.4.101.29 – 10.4.101.30	10.4.101.31
73	10.4.101.32/30	10.4.101.33 – 10.4.101.34	10.4.101.35
74	10.4.101.36/30	10.4.101.37 – 10.4.101.38	10.4.101.39
75	10.4.101.40/30	10.4.101.41 – 10.4.101.42	10.4.101.43
76	10.4.101.44/30	10.4.101.45 – 10.4.101.46	10.4.101.47
77	10.4.101.48/30	10.4.101.49 – 10.4.101.50	10.4.101.51
78	10.4.101.52/30	10.4.101.53 – 10.4.101.54	10.4.101.55
79	10.4.101.56/30	10.4.101.57 – 10.4.101.58	10.4.101.59
80	10.4.101.60/30	10.4.101.61 – 10.4.101.62	10.4.101.63
81	10.4.101.64/30	10.4.101.65 – 10.4.101.66	10.4.101.67
82	10.4.101.68/30	10.4.101.69 – 10.4.101.70	10.4.101.71
83	10.4.101.72/30	10.4.101.73 – 10.4.101.74	10.4.101.75
84	10.4.101.76/30	10.4.101.77 – 10.4.101.78	10.4.101.79
85	10.4.101.80/30	10.4.101.81 – 10.4.101.82	10.4.101.83
86	10.4.101.84/30	10.4.101.85 – 10.4.101.86	10.4.101.87
87	10.4.101.88/30	10.4.101.89 – 10.4.101.90	10.4.101.91
88	10.4.101.92/30	10.4.101.93 – 10.4.101.94	10.4.101.95
89	10.4.101.96/30	10.4.101.97 – 10.4.101.98	10.4.101.99
90	10.4.101.100/30	10.4.101.101 – 10.4.101.102	10.4.101.103
91	10.4.101.104/30	10.4.101.105 – 10.4.101.106	10.4.101.107
92	10.4.101.108/30	10.4.101.109 – 10.4.101.110	10.4.101.111
93	10.4.101.112/30	10.4.101.113 – 10.4.101.114	10.4.101.115
94	10.4.101.116/30	10.4.101.117 – 10.4.101.118	10.4.101.119
95	10.4.101.120/30	10.4.101.121 – 10.4.101.122	10.4.101.123
96	10.4.101.124/30	10.4.101.125 – 10.4.101.126	10.4.101.127
97	10.4.101.128/30	10.4.101.129 – 10.4.101.130	10.4.101.131
98	10.4.101.132/30	10.4.101.133 – 10.4.101.134	10.4.101.135
99	10.4.101.136/30	10.4.101.137 – 10.4.101.138	10.4.101.139
100	10.4.101.140/30	10.4.101.141 – 10.4.101.142	10.4.101.143
101	10.4.101.144/30	10.4.101.145 – 10.4.101.146	10.4.101.147
102	10.4.101.148/30	10.4.101.149 – 10.4.101.150	10.4.101.151
103	10.4.101.152/30	10.4.101.153 – 10.4.101.154	10.4.101.155
104	10.4.101.156/30	10.4.101.157 – 10.4.101.158	10.4.101.159
105	10.4.101.160/30	10.4.101.161 – 10.4.101.162	10.4.101.163
106	10.4.101.164/30	10.4.101.165 – 10.4.101.166	10.4.101.167
107	10.4.101.168/30	10.4.101.169 – 10.4.101.170	10.4.101.171
108	10.4.101.172/30	10.4.101.173 – 10.4.101.174	10.4.101.175
109	10.4.101.176/30	10.4.101.177 – 10.4.101.178	10.4.101.179
110	10.4.101.180/30	10.4.101.181 – 10.4.101.182	10.4.101.183
111	10.4.101.184/30	10.4.101.185 – 10.4.101.186	10.4.101.187
112	10.4.101.188/30	10.4.101.189 – 10.4.101.190	10.4.101.191
113	10.4.101.192/30	10.4.101.193 – 10.4.101.194	10.4.101.195
114	10.4.101.196/30	10.4.101.197 – 10.4.101.198	10.4.101.199
115	10.4.101.200/30	10.4.101.201 – 10.4.101.202	10.4.101.203
116	10.4.101.204/30	10.4.101.205 – 10.4.101.206	10.4.101.207
117	10.4.101.208/30	10.4.101.209 – 10.4.101.210	10.4.101.211
118	10.4.101.212/30	10.4.101.213 – 10.4.101.214	10.4.101.215
119	10.4.101.216/30	10.4.101.217 – 10.4.101.218	10.4.101.219
120	10.4.101.220/30	10.4.101.221 – 10.4.101.222	10.4.101.223
121	10.4.101.224/30	10.4.101.225 – 10.4.101.226	10.4.101.227
122	10.4.101.228/30	10.4.101.229 – 10.4.101.230	10.4.101.231
123	10.4.101.232/30	10.4.101.233 – 10.4.101.234	10.4.101.235
124	10.4.101.236/30	10.4.101.237 – 10.4.101.238	10.4.101.239
125	10.4.101.240/30	10.4.101.241 – 10.4.101.242	10.4.101.243
126	10.4.101.244/30	10.4.101.245 – 10.4.101.246	10.4.101.247
127	10.4.101.248/30	10.4.101.249 – 10.4.101.250	10.4.101.251
128	10.4.101.252/30	10.4.101.253 – 10.4.101.254	10.4.101.255

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 →