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)172.16.4.0/23

network172.16.4.0/23

broadcast172.16.5.255

first host172.16.4.1

last host172.16.5.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classB

ipcalc 172.16.4.0/23

address10101100.00010000.00000100.00000000

subnet mask11111111.11111111.11111110.00000000

network10101100.00010000.00000100.00000000

broadcast10101100.00010000.00000101.11111111

green = network part, grey = host part

hex0xac100400

decimal2886730752

reverse dns0.4.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:400

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	172.16.4.0/30	172.16.4.1 – 172.16.4.2	172.16.4.3
2	172.16.4.4/30	172.16.4.5 – 172.16.4.6	172.16.4.7
3	172.16.4.8/30	172.16.4.9 – 172.16.4.10	172.16.4.11
4	172.16.4.12/30	172.16.4.13 – 172.16.4.14	172.16.4.15
5	172.16.4.16/30	172.16.4.17 – 172.16.4.18	172.16.4.19
6	172.16.4.20/30	172.16.4.21 – 172.16.4.22	172.16.4.23
7	172.16.4.24/30	172.16.4.25 – 172.16.4.26	172.16.4.27
8	172.16.4.28/30	172.16.4.29 – 172.16.4.30	172.16.4.31
9	172.16.4.32/30	172.16.4.33 – 172.16.4.34	172.16.4.35
10	172.16.4.36/30	172.16.4.37 – 172.16.4.38	172.16.4.39
11	172.16.4.40/30	172.16.4.41 – 172.16.4.42	172.16.4.43
12	172.16.4.44/30	172.16.4.45 – 172.16.4.46	172.16.4.47
13	172.16.4.48/30	172.16.4.49 – 172.16.4.50	172.16.4.51
14	172.16.4.52/30	172.16.4.53 – 172.16.4.54	172.16.4.55
15	172.16.4.56/30	172.16.4.57 – 172.16.4.58	172.16.4.59
16	172.16.4.60/30	172.16.4.61 – 172.16.4.62	172.16.4.63
17	172.16.4.64/30	172.16.4.65 – 172.16.4.66	172.16.4.67
18	172.16.4.68/30	172.16.4.69 – 172.16.4.70	172.16.4.71
19	172.16.4.72/30	172.16.4.73 – 172.16.4.74	172.16.4.75
20	172.16.4.76/30	172.16.4.77 – 172.16.4.78	172.16.4.79
21	172.16.4.80/30	172.16.4.81 – 172.16.4.82	172.16.4.83
22	172.16.4.84/30	172.16.4.85 – 172.16.4.86	172.16.4.87
23	172.16.4.88/30	172.16.4.89 – 172.16.4.90	172.16.4.91
24	172.16.4.92/30	172.16.4.93 – 172.16.4.94	172.16.4.95
25	172.16.4.96/30	172.16.4.97 – 172.16.4.98	172.16.4.99
26	172.16.4.100/30	172.16.4.101 – 172.16.4.102	172.16.4.103
27	172.16.4.104/30	172.16.4.105 – 172.16.4.106	172.16.4.107
28	172.16.4.108/30	172.16.4.109 – 172.16.4.110	172.16.4.111
29	172.16.4.112/30	172.16.4.113 – 172.16.4.114	172.16.4.115
30	172.16.4.116/30	172.16.4.117 – 172.16.4.118	172.16.4.119
31	172.16.4.120/30	172.16.4.121 – 172.16.4.122	172.16.4.123
32	172.16.4.124/30	172.16.4.125 – 172.16.4.126	172.16.4.127
33	172.16.4.128/30	172.16.4.129 – 172.16.4.130	172.16.4.131
34	172.16.4.132/30	172.16.4.133 – 172.16.4.134	172.16.4.135
35	172.16.4.136/30	172.16.4.137 – 172.16.4.138	172.16.4.139
36	172.16.4.140/30	172.16.4.141 – 172.16.4.142	172.16.4.143
37	172.16.4.144/30	172.16.4.145 – 172.16.4.146	172.16.4.147
38	172.16.4.148/30	172.16.4.149 – 172.16.4.150	172.16.4.151
39	172.16.4.152/30	172.16.4.153 – 172.16.4.154	172.16.4.155
40	172.16.4.156/30	172.16.4.157 – 172.16.4.158	172.16.4.159
41	172.16.4.160/30	172.16.4.161 – 172.16.4.162	172.16.4.163
42	172.16.4.164/30	172.16.4.165 – 172.16.4.166	172.16.4.167
43	172.16.4.168/30	172.16.4.169 – 172.16.4.170	172.16.4.171
44	172.16.4.172/30	172.16.4.173 – 172.16.4.174	172.16.4.175
45	172.16.4.176/30	172.16.4.177 – 172.16.4.178	172.16.4.179
46	172.16.4.180/30	172.16.4.181 – 172.16.4.182	172.16.4.183
47	172.16.4.184/30	172.16.4.185 – 172.16.4.186	172.16.4.187
48	172.16.4.188/30	172.16.4.189 – 172.16.4.190	172.16.4.191
49	172.16.4.192/30	172.16.4.193 – 172.16.4.194	172.16.4.195
50	172.16.4.196/30	172.16.4.197 – 172.16.4.198	172.16.4.199
51	172.16.4.200/30	172.16.4.201 – 172.16.4.202	172.16.4.203
52	172.16.4.204/30	172.16.4.205 – 172.16.4.206	172.16.4.207
53	172.16.4.208/30	172.16.4.209 – 172.16.4.210	172.16.4.211
54	172.16.4.212/30	172.16.4.213 – 172.16.4.214	172.16.4.215
55	172.16.4.216/30	172.16.4.217 – 172.16.4.218	172.16.4.219
56	172.16.4.220/30	172.16.4.221 – 172.16.4.222	172.16.4.223
57	172.16.4.224/30	172.16.4.225 – 172.16.4.226	172.16.4.227
58	172.16.4.228/30	172.16.4.229 – 172.16.4.230	172.16.4.231
59	172.16.4.232/30	172.16.4.233 – 172.16.4.234	172.16.4.235
60	172.16.4.236/30	172.16.4.237 – 172.16.4.238	172.16.4.239
61	172.16.4.240/30	172.16.4.241 – 172.16.4.242	172.16.4.243
62	172.16.4.244/30	172.16.4.245 – 172.16.4.246	172.16.4.247
63	172.16.4.248/30	172.16.4.249 – 172.16.4.250	172.16.4.251
64	172.16.4.252/30	172.16.4.253 – 172.16.4.254	172.16.4.255
65	172.16.5.0/30	172.16.5.1 – 172.16.5.2	172.16.5.3
66	172.16.5.4/30	172.16.5.5 – 172.16.5.6	172.16.5.7
67	172.16.5.8/30	172.16.5.9 – 172.16.5.10	172.16.5.11
68	172.16.5.12/30	172.16.5.13 – 172.16.5.14	172.16.5.15
69	172.16.5.16/30	172.16.5.17 – 172.16.5.18	172.16.5.19
70	172.16.5.20/30	172.16.5.21 – 172.16.5.22	172.16.5.23
71	172.16.5.24/30	172.16.5.25 – 172.16.5.26	172.16.5.27
72	172.16.5.28/30	172.16.5.29 – 172.16.5.30	172.16.5.31
73	172.16.5.32/30	172.16.5.33 – 172.16.5.34	172.16.5.35
74	172.16.5.36/30	172.16.5.37 – 172.16.5.38	172.16.5.39
75	172.16.5.40/30	172.16.5.41 – 172.16.5.42	172.16.5.43
76	172.16.5.44/30	172.16.5.45 – 172.16.5.46	172.16.5.47
77	172.16.5.48/30	172.16.5.49 – 172.16.5.50	172.16.5.51
78	172.16.5.52/30	172.16.5.53 – 172.16.5.54	172.16.5.55
79	172.16.5.56/30	172.16.5.57 – 172.16.5.58	172.16.5.59
80	172.16.5.60/30	172.16.5.61 – 172.16.5.62	172.16.5.63
81	172.16.5.64/30	172.16.5.65 – 172.16.5.66	172.16.5.67
82	172.16.5.68/30	172.16.5.69 – 172.16.5.70	172.16.5.71
83	172.16.5.72/30	172.16.5.73 – 172.16.5.74	172.16.5.75
84	172.16.5.76/30	172.16.5.77 – 172.16.5.78	172.16.5.79
85	172.16.5.80/30	172.16.5.81 – 172.16.5.82	172.16.5.83
86	172.16.5.84/30	172.16.5.85 – 172.16.5.86	172.16.5.87
87	172.16.5.88/30	172.16.5.89 – 172.16.5.90	172.16.5.91
88	172.16.5.92/30	172.16.5.93 – 172.16.5.94	172.16.5.95
89	172.16.5.96/30	172.16.5.97 – 172.16.5.98	172.16.5.99
90	172.16.5.100/30	172.16.5.101 – 172.16.5.102	172.16.5.103
91	172.16.5.104/30	172.16.5.105 – 172.16.5.106	172.16.5.107
92	172.16.5.108/30	172.16.5.109 – 172.16.5.110	172.16.5.111
93	172.16.5.112/30	172.16.5.113 – 172.16.5.114	172.16.5.115
94	172.16.5.116/30	172.16.5.117 – 172.16.5.118	172.16.5.119
95	172.16.5.120/30	172.16.5.121 – 172.16.5.122	172.16.5.123
96	172.16.5.124/30	172.16.5.125 – 172.16.5.126	172.16.5.127
97	172.16.5.128/30	172.16.5.129 – 172.16.5.130	172.16.5.131
98	172.16.5.132/30	172.16.5.133 – 172.16.5.134	172.16.5.135
99	172.16.5.136/30	172.16.5.137 – 172.16.5.138	172.16.5.139
100	172.16.5.140/30	172.16.5.141 – 172.16.5.142	172.16.5.143
101	172.16.5.144/30	172.16.5.145 – 172.16.5.146	172.16.5.147
102	172.16.5.148/30	172.16.5.149 – 172.16.5.150	172.16.5.151
103	172.16.5.152/30	172.16.5.153 – 172.16.5.154	172.16.5.155
104	172.16.5.156/30	172.16.5.157 – 172.16.5.158	172.16.5.159
105	172.16.5.160/30	172.16.5.161 – 172.16.5.162	172.16.5.163
106	172.16.5.164/30	172.16.5.165 – 172.16.5.166	172.16.5.167
107	172.16.5.168/30	172.16.5.169 – 172.16.5.170	172.16.5.171
108	172.16.5.172/30	172.16.5.173 – 172.16.5.174	172.16.5.175
109	172.16.5.176/30	172.16.5.177 – 172.16.5.178	172.16.5.179
110	172.16.5.180/30	172.16.5.181 – 172.16.5.182	172.16.5.183
111	172.16.5.184/30	172.16.5.185 – 172.16.5.186	172.16.5.187
112	172.16.5.188/30	172.16.5.189 – 172.16.5.190	172.16.5.191
113	172.16.5.192/30	172.16.5.193 – 172.16.5.194	172.16.5.195
114	172.16.5.196/30	172.16.5.197 – 172.16.5.198	172.16.5.199
115	172.16.5.200/30	172.16.5.201 – 172.16.5.202	172.16.5.203
116	172.16.5.204/30	172.16.5.205 – 172.16.5.206	172.16.5.207
117	172.16.5.208/30	172.16.5.209 – 172.16.5.210	172.16.5.211
118	172.16.5.212/30	172.16.5.213 – 172.16.5.214	172.16.5.215
119	172.16.5.216/30	172.16.5.217 – 172.16.5.218	172.16.5.219
120	172.16.5.220/30	172.16.5.221 – 172.16.5.222	172.16.5.223
121	172.16.5.224/30	172.16.5.225 – 172.16.5.226	172.16.5.227
122	172.16.5.228/30	172.16.5.229 – 172.16.5.230	172.16.5.231
123	172.16.5.232/30	172.16.5.233 – 172.16.5.234	172.16.5.235
124	172.16.5.236/30	172.16.5.237 – 172.16.5.238	172.16.5.239
125	172.16.5.240/30	172.16.5.241 – 172.16.5.242	172.16.5.243
126	172.16.5.244/30	172.16.5.245 – 172.16.5.246	172.16.5.247
127	172.16.5.248/30	172.16.5.249 – 172.16.5.250	172.16.5.251
128	172.16.5.252/30	172.16.5.253 – 172.16.5.254	172.16.5.255

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 →