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)10.2.204.0/23

network10.2.204.0/23

broadcast10.2.205.255

first host10.2.204.1

last host10.2.205.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.204.0/23

address00001010.00000010.11001100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.11001100.00000000

broadcast00001010.00000010.11001101.11111111

green = network part, grey = host part

hex0x0a02cc00

decimal167955456

reverse dns0.204.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:cc00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.204.0/30	10.2.204.1 – 10.2.204.2	10.2.204.3
2	10.2.204.4/30	10.2.204.5 – 10.2.204.6	10.2.204.7
3	10.2.204.8/30	10.2.204.9 – 10.2.204.10	10.2.204.11
4	10.2.204.12/30	10.2.204.13 – 10.2.204.14	10.2.204.15
5	10.2.204.16/30	10.2.204.17 – 10.2.204.18	10.2.204.19
6	10.2.204.20/30	10.2.204.21 – 10.2.204.22	10.2.204.23
7	10.2.204.24/30	10.2.204.25 – 10.2.204.26	10.2.204.27
8	10.2.204.28/30	10.2.204.29 – 10.2.204.30	10.2.204.31
9	10.2.204.32/30	10.2.204.33 – 10.2.204.34	10.2.204.35
10	10.2.204.36/30	10.2.204.37 – 10.2.204.38	10.2.204.39
11	10.2.204.40/30	10.2.204.41 – 10.2.204.42	10.2.204.43
12	10.2.204.44/30	10.2.204.45 – 10.2.204.46	10.2.204.47
13	10.2.204.48/30	10.2.204.49 – 10.2.204.50	10.2.204.51
14	10.2.204.52/30	10.2.204.53 – 10.2.204.54	10.2.204.55
15	10.2.204.56/30	10.2.204.57 – 10.2.204.58	10.2.204.59
16	10.2.204.60/30	10.2.204.61 – 10.2.204.62	10.2.204.63
17	10.2.204.64/30	10.2.204.65 – 10.2.204.66	10.2.204.67
18	10.2.204.68/30	10.2.204.69 – 10.2.204.70	10.2.204.71
19	10.2.204.72/30	10.2.204.73 – 10.2.204.74	10.2.204.75
20	10.2.204.76/30	10.2.204.77 – 10.2.204.78	10.2.204.79
21	10.2.204.80/30	10.2.204.81 – 10.2.204.82	10.2.204.83
22	10.2.204.84/30	10.2.204.85 – 10.2.204.86	10.2.204.87
23	10.2.204.88/30	10.2.204.89 – 10.2.204.90	10.2.204.91
24	10.2.204.92/30	10.2.204.93 – 10.2.204.94	10.2.204.95
25	10.2.204.96/30	10.2.204.97 – 10.2.204.98	10.2.204.99
26	10.2.204.100/30	10.2.204.101 – 10.2.204.102	10.2.204.103
27	10.2.204.104/30	10.2.204.105 – 10.2.204.106	10.2.204.107
28	10.2.204.108/30	10.2.204.109 – 10.2.204.110	10.2.204.111
29	10.2.204.112/30	10.2.204.113 – 10.2.204.114	10.2.204.115
30	10.2.204.116/30	10.2.204.117 – 10.2.204.118	10.2.204.119
31	10.2.204.120/30	10.2.204.121 – 10.2.204.122	10.2.204.123
32	10.2.204.124/30	10.2.204.125 – 10.2.204.126	10.2.204.127
33	10.2.204.128/30	10.2.204.129 – 10.2.204.130	10.2.204.131
34	10.2.204.132/30	10.2.204.133 – 10.2.204.134	10.2.204.135
35	10.2.204.136/30	10.2.204.137 – 10.2.204.138	10.2.204.139
36	10.2.204.140/30	10.2.204.141 – 10.2.204.142	10.2.204.143
37	10.2.204.144/30	10.2.204.145 – 10.2.204.146	10.2.204.147
38	10.2.204.148/30	10.2.204.149 – 10.2.204.150	10.2.204.151
39	10.2.204.152/30	10.2.204.153 – 10.2.204.154	10.2.204.155
40	10.2.204.156/30	10.2.204.157 – 10.2.204.158	10.2.204.159
41	10.2.204.160/30	10.2.204.161 – 10.2.204.162	10.2.204.163
42	10.2.204.164/30	10.2.204.165 – 10.2.204.166	10.2.204.167
43	10.2.204.168/30	10.2.204.169 – 10.2.204.170	10.2.204.171
44	10.2.204.172/30	10.2.204.173 – 10.2.204.174	10.2.204.175
45	10.2.204.176/30	10.2.204.177 – 10.2.204.178	10.2.204.179
46	10.2.204.180/30	10.2.204.181 – 10.2.204.182	10.2.204.183
47	10.2.204.184/30	10.2.204.185 – 10.2.204.186	10.2.204.187
48	10.2.204.188/30	10.2.204.189 – 10.2.204.190	10.2.204.191
49	10.2.204.192/30	10.2.204.193 – 10.2.204.194	10.2.204.195
50	10.2.204.196/30	10.2.204.197 – 10.2.204.198	10.2.204.199
51	10.2.204.200/30	10.2.204.201 – 10.2.204.202	10.2.204.203
52	10.2.204.204/30	10.2.204.205 – 10.2.204.206	10.2.204.207
53	10.2.204.208/30	10.2.204.209 – 10.2.204.210	10.2.204.211
54	10.2.204.212/30	10.2.204.213 – 10.2.204.214	10.2.204.215
55	10.2.204.216/30	10.2.204.217 – 10.2.204.218	10.2.204.219
56	10.2.204.220/30	10.2.204.221 – 10.2.204.222	10.2.204.223
57	10.2.204.224/30	10.2.204.225 – 10.2.204.226	10.2.204.227
58	10.2.204.228/30	10.2.204.229 – 10.2.204.230	10.2.204.231
59	10.2.204.232/30	10.2.204.233 – 10.2.204.234	10.2.204.235
60	10.2.204.236/30	10.2.204.237 – 10.2.204.238	10.2.204.239
61	10.2.204.240/30	10.2.204.241 – 10.2.204.242	10.2.204.243
62	10.2.204.244/30	10.2.204.245 – 10.2.204.246	10.2.204.247
63	10.2.204.248/30	10.2.204.249 – 10.2.204.250	10.2.204.251
64	10.2.204.252/30	10.2.204.253 – 10.2.204.254	10.2.204.255
65	10.2.205.0/30	10.2.205.1 – 10.2.205.2	10.2.205.3
66	10.2.205.4/30	10.2.205.5 – 10.2.205.6	10.2.205.7
67	10.2.205.8/30	10.2.205.9 – 10.2.205.10	10.2.205.11
68	10.2.205.12/30	10.2.205.13 – 10.2.205.14	10.2.205.15
69	10.2.205.16/30	10.2.205.17 – 10.2.205.18	10.2.205.19
70	10.2.205.20/30	10.2.205.21 – 10.2.205.22	10.2.205.23
71	10.2.205.24/30	10.2.205.25 – 10.2.205.26	10.2.205.27
72	10.2.205.28/30	10.2.205.29 – 10.2.205.30	10.2.205.31
73	10.2.205.32/30	10.2.205.33 – 10.2.205.34	10.2.205.35
74	10.2.205.36/30	10.2.205.37 – 10.2.205.38	10.2.205.39
75	10.2.205.40/30	10.2.205.41 – 10.2.205.42	10.2.205.43
76	10.2.205.44/30	10.2.205.45 – 10.2.205.46	10.2.205.47
77	10.2.205.48/30	10.2.205.49 – 10.2.205.50	10.2.205.51
78	10.2.205.52/30	10.2.205.53 – 10.2.205.54	10.2.205.55
79	10.2.205.56/30	10.2.205.57 – 10.2.205.58	10.2.205.59
80	10.2.205.60/30	10.2.205.61 – 10.2.205.62	10.2.205.63
81	10.2.205.64/30	10.2.205.65 – 10.2.205.66	10.2.205.67
82	10.2.205.68/30	10.2.205.69 – 10.2.205.70	10.2.205.71
83	10.2.205.72/30	10.2.205.73 – 10.2.205.74	10.2.205.75
84	10.2.205.76/30	10.2.205.77 – 10.2.205.78	10.2.205.79
85	10.2.205.80/30	10.2.205.81 – 10.2.205.82	10.2.205.83
86	10.2.205.84/30	10.2.205.85 – 10.2.205.86	10.2.205.87
87	10.2.205.88/30	10.2.205.89 – 10.2.205.90	10.2.205.91
88	10.2.205.92/30	10.2.205.93 – 10.2.205.94	10.2.205.95
89	10.2.205.96/30	10.2.205.97 – 10.2.205.98	10.2.205.99
90	10.2.205.100/30	10.2.205.101 – 10.2.205.102	10.2.205.103
91	10.2.205.104/30	10.2.205.105 – 10.2.205.106	10.2.205.107
92	10.2.205.108/30	10.2.205.109 – 10.2.205.110	10.2.205.111
93	10.2.205.112/30	10.2.205.113 – 10.2.205.114	10.2.205.115
94	10.2.205.116/30	10.2.205.117 – 10.2.205.118	10.2.205.119
95	10.2.205.120/30	10.2.205.121 – 10.2.205.122	10.2.205.123
96	10.2.205.124/30	10.2.205.125 – 10.2.205.126	10.2.205.127
97	10.2.205.128/30	10.2.205.129 – 10.2.205.130	10.2.205.131
98	10.2.205.132/30	10.2.205.133 – 10.2.205.134	10.2.205.135
99	10.2.205.136/30	10.2.205.137 – 10.2.205.138	10.2.205.139
100	10.2.205.140/30	10.2.205.141 – 10.2.205.142	10.2.205.143
101	10.2.205.144/30	10.2.205.145 – 10.2.205.146	10.2.205.147
102	10.2.205.148/30	10.2.205.149 – 10.2.205.150	10.2.205.151
103	10.2.205.152/30	10.2.205.153 – 10.2.205.154	10.2.205.155
104	10.2.205.156/30	10.2.205.157 – 10.2.205.158	10.2.205.159
105	10.2.205.160/30	10.2.205.161 – 10.2.205.162	10.2.205.163
106	10.2.205.164/30	10.2.205.165 – 10.2.205.166	10.2.205.167
107	10.2.205.168/30	10.2.205.169 – 10.2.205.170	10.2.205.171
108	10.2.205.172/30	10.2.205.173 – 10.2.205.174	10.2.205.175
109	10.2.205.176/30	10.2.205.177 – 10.2.205.178	10.2.205.179
110	10.2.205.180/30	10.2.205.181 – 10.2.205.182	10.2.205.183
111	10.2.205.184/30	10.2.205.185 – 10.2.205.186	10.2.205.187
112	10.2.205.188/30	10.2.205.189 – 10.2.205.190	10.2.205.191
113	10.2.205.192/30	10.2.205.193 – 10.2.205.194	10.2.205.195
114	10.2.205.196/30	10.2.205.197 – 10.2.205.198	10.2.205.199
115	10.2.205.200/30	10.2.205.201 – 10.2.205.202	10.2.205.203
116	10.2.205.204/30	10.2.205.205 – 10.2.205.206	10.2.205.207
117	10.2.205.208/30	10.2.205.209 – 10.2.205.210	10.2.205.211
118	10.2.205.212/30	10.2.205.213 – 10.2.205.214	10.2.205.215
119	10.2.205.216/30	10.2.205.217 – 10.2.205.218	10.2.205.219
120	10.2.205.220/30	10.2.205.221 – 10.2.205.222	10.2.205.223
121	10.2.205.224/30	10.2.205.225 – 10.2.205.226	10.2.205.227
122	10.2.205.228/30	10.2.205.229 – 10.2.205.230	10.2.205.231
123	10.2.205.232/30	10.2.205.233 – 10.2.205.234	10.2.205.235
124	10.2.205.236/30	10.2.205.237 – 10.2.205.238	10.2.205.239
125	10.2.205.240/30	10.2.205.241 – 10.2.205.242	10.2.205.243
126	10.2.205.244/30	10.2.205.245 – 10.2.205.246	10.2.205.247
127	10.2.205.248/30	10.2.205.249 – 10.2.205.250	10.2.205.251
128	10.2.205.252/30	10.2.205.253 – 10.2.205.254	10.2.205.255

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 →