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)10.2.186.0/23

network10.2.186.0/23

broadcast10.2.187.255

first host10.2.186.1

last host10.2.187.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.186.0/23

address00001010.00000010.10111010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.10111010.00000000

broadcast00001010.00000010.10111011.11111111

green = network part, grey = host part

hex0x0a02ba00

decimal167950848

reverse dns0.186.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:ba00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.186.0/30	10.2.186.1 – 10.2.186.2	10.2.186.3
2	10.2.186.4/30	10.2.186.5 – 10.2.186.6	10.2.186.7
3	10.2.186.8/30	10.2.186.9 – 10.2.186.10	10.2.186.11
4	10.2.186.12/30	10.2.186.13 – 10.2.186.14	10.2.186.15
5	10.2.186.16/30	10.2.186.17 – 10.2.186.18	10.2.186.19
6	10.2.186.20/30	10.2.186.21 – 10.2.186.22	10.2.186.23
7	10.2.186.24/30	10.2.186.25 – 10.2.186.26	10.2.186.27
8	10.2.186.28/30	10.2.186.29 – 10.2.186.30	10.2.186.31
9	10.2.186.32/30	10.2.186.33 – 10.2.186.34	10.2.186.35
10	10.2.186.36/30	10.2.186.37 – 10.2.186.38	10.2.186.39
11	10.2.186.40/30	10.2.186.41 – 10.2.186.42	10.2.186.43
12	10.2.186.44/30	10.2.186.45 – 10.2.186.46	10.2.186.47
13	10.2.186.48/30	10.2.186.49 – 10.2.186.50	10.2.186.51
14	10.2.186.52/30	10.2.186.53 – 10.2.186.54	10.2.186.55
15	10.2.186.56/30	10.2.186.57 – 10.2.186.58	10.2.186.59
16	10.2.186.60/30	10.2.186.61 – 10.2.186.62	10.2.186.63
17	10.2.186.64/30	10.2.186.65 – 10.2.186.66	10.2.186.67
18	10.2.186.68/30	10.2.186.69 – 10.2.186.70	10.2.186.71
19	10.2.186.72/30	10.2.186.73 – 10.2.186.74	10.2.186.75
20	10.2.186.76/30	10.2.186.77 – 10.2.186.78	10.2.186.79
21	10.2.186.80/30	10.2.186.81 – 10.2.186.82	10.2.186.83
22	10.2.186.84/30	10.2.186.85 – 10.2.186.86	10.2.186.87
23	10.2.186.88/30	10.2.186.89 – 10.2.186.90	10.2.186.91
24	10.2.186.92/30	10.2.186.93 – 10.2.186.94	10.2.186.95
25	10.2.186.96/30	10.2.186.97 – 10.2.186.98	10.2.186.99
26	10.2.186.100/30	10.2.186.101 – 10.2.186.102	10.2.186.103
27	10.2.186.104/30	10.2.186.105 – 10.2.186.106	10.2.186.107
28	10.2.186.108/30	10.2.186.109 – 10.2.186.110	10.2.186.111
29	10.2.186.112/30	10.2.186.113 – 10.2.186.114	10.2.186.115
30	10.2.186.116/30	10.2.186.117 – 10.2.186.118	10.2.186.119
31	10.2.186.120/30	10.2.186.121 – 10.2.186.122	10.2.186.123
32	10.2.186.124/30	10.2.186.125 – 10.2.186.126	10.2.186.127
33	10.2.186.128/30	10.2.186.129 – 10.2.186.130	10.2.186.131
34	10.2.186.132/30	10.2.186.133 – 10.2.186.134	10.2.186.135
35	10.2.186.136/30	10.2.186.137 – 10.2.186.138	10.2.186.139
36	10.2.186.140/30	10.2.186.141 – 10.2.186.142	10.2.186.143
37	10.2.186.144/30	10.2.186.145 – 10.2.186.146	10.2.186.147
38	10.2.186.148/30	10.2.186.149 – 10.2.186.150	10.2.186.151
39	10.2.186.152/30	10.2.186.153 – 10.2.186.154	10.2.186.155
40	10.2.186.156/30	10.2.186.157 – 10.2.186.158	10.2.186.159
41	10.2.186.160/30	10.2.186.161 – 10.2.186.162	10.2.186.163
42	10.2.186.164/30	10.2.186.165 – 10.2.186.166	10.2.186.167
43	10.2.186.168/30	10.2.186.169 – 10.2.186.170	10.2.186.171
44	10.2.186.172/30	10.2.186.173 – 10.2.186.174	10.2.186.175
45	10.2.186.176/30	10.2.186.177 – 10.2.186.178	10.2.186.179
46	10.2.186.180/30	10.2.186.181 – 10.2.186.182	10.2.186.183
47	10.2.186.184/30	10.2.186.185 – 10.2.186.186	10.2.186.187
48	10.2.186.188/30	10.2.186.189 – 10.2.186.190	10.2.186.191
49	10.2.186.192/30	10.2.186.193 – 10.2.186.194	10.2.186.195
50	10.2.186.196/30	10.2.186.197 – 10.2.186.198	10.2.186.199
51	10.2.186.200/30	10.2.186.201 – 10.2.186.202	10.2.186.203
52	10.2.186.204/30	10.2.186.205 – 10.2.186.206	10.2.186.207
53	10.2.186.208/30	10.2.186.209 – 10.2.186.210	10.2.186.211
54	10.2.186.212/30	10.2.186.213 – 10.2.186.214	10.2.186.215
55	10.2.186.216/30	10.2.186.217 – 10.2.186.218	10.2.186.219
56	10.2.186.220/30	10.2.186.221 – 10.2.186.222	10.2.186.223
57	10.2.186.224/30	10.2.186.225 – 10.2.186.226	10.2.186.227
58	10.2.186.228/30	10.2.186.229 – 10.2.186.230	10.2.186.231
59	10.2.186.232/30	10.2.186.233 – 10.2.186.234	10.2.186.235
60	10.2.186.236/30	10.2.186.237 – 10.2.186.238	10.2.186.239
61	10.2.186.240/30	10.2.186.241 – 10.2.186.242	10.2.186.243
62	10.2.186.244/30	10.2.186.245 – 10.2.186.246	10.2.186.247
63	10.2.186.248/30	10.2.186.249 – 10.2.186.250	10.2.186.251
64	10.2.186.252/30	10.2.186.253 – 10.2.186.254	10.2.186.255
65	10.2.187.0/30	10.2.187.1 – 10.2.187.2	10.2.187.3
66	10.2.187.4/30	10.2.187.5 – 10.2.187.6	10.2.187.7
67	10.2.187.8/30	10.2.187.9 – 10.2.187.10	10.2.187.11
68	10.2.187.12/30	10.2.187.13 – 10.2.187.14	10.2.187.15
69	10.2.187.16/30	10.2.187.17 – 10.2.187.18	10.2.187.19
70	10.2.187.20/30	10.2.187.21 – 10.2.187.22	10.2.187.23
71	10.2.187.24/30	10.2.187.25 – 10.2.187.26	10.2.187.27
72	10.2.187.28/30	10.2.187.29 – 10.2.187.30	10.2.187.31
73	10.2.187.32/30	10.2.187.33 – 10.2.187.34	10.2.187.35
74	10.2.187.36/30	10.2.187.37 – 10.2.187.38	10.2.187.39
75	10.2.187.40/30	10.2.187.41 – 10.2.187.42	10.2.187.43
76	10.2.187.44/30	10.2.187.45 – 10.2.187.46	10.2.187.47
77	10.2.187.48/30	10.2.187.49 – 10.2.187.50	10.2.187.51
78	10.2.187.52/30	10.2.187.53 – 10.2.187.54	10.2.187.55
79	10.2.187.56/30	10.2.187.57 – 10.2.187.58	10.2.187.59
80	10.2.187.60/30	10.2.187.61 – 10.2.187.62	10.2.187.63
81	10.2.187.64/30	10.2.187.65 – 10.2.187.66	10.2.187.67
82	10.2.187.68/30	10.2.187.69 – 10.2.187.70	10.2.187.71
83	10.2.187.72/30	10.2.187.73 – 10.2.187.74	10.2.187.75
84	10.2.187.76/30	10.2.187.77 – 10.2.187.78	10.2.187.79
85	10.2.187.80/30	10.2.187.81 – 10.2.187.82	10.2.187.83
86	10.2.187.84/30	10.2.187.85 – 10.2.187.86	10.2.187.87
87	10.2.187.88/30	10.2.187.89 – 10.2.187.90	10.2.187.91
88	10.2.187.92/30	10.2.187.93 – 10.2.187.94	10.2.187.95
89	10.2.187.96/30	10.2.187.97 – 10.2.187.98	10.2.187.99
90	10.2.187.100/30	10.2.187.101 – 10.2.187.102	10.2.187.103
91	10.2.187.104/30	10.2.187.105 – 10.2.187.106	10.2.187.107
92	10.2.187.108/30	10.2.187.109 – 10.2.187.110	10.2.187.111
93	10.2.187.112/30	10.2.187.113 – 10.2.187.114	10.2.187.115
94	10.2.187.116/30	10.2.187.117 – 10.2.187.118	10.2.187.119
95	10.2.187.120/30	10.2.187.121 – 10.2.187.122	10.2.187.123
96	10.2.187.124/30	10.2.187.125 – 10.2.187.126	10.2.187.127
97	10.2.187.128/30	10.2.187.129 – 10.2.187.130	10.2.187.131
98	10.2.187.132/30	10.2.187.133 – 10.2.187.134	10.2.187.135
99	10.2.187.136/30	10.2.187.137 – 10.2.187.138	10.2.187.139
100	10.2.187.140/30	10.2.187.141 – 10.2.187.142	10.2.187.143
101	10.2.187.144/30	10.2.187.145 – 10.2.187.146	10.2.187.147
102	10.2.187.148/30	10.2.187.149 – 10.2.187.150	10.2.187.151
103	10.2.187.152/30	10.2.187.153 – 10.2.187.154	10.2.187.155
104	10.2.187.156/30	10.2.187.157 – 10.2.187.158	10.2.187.159
105	10.2.187.160/30	10.2.187.161 – 10.2.187.162	10.2.187.163
106	10.2.187.164/30	10.2.187.165 – 10.2.187.166	10.2.187.167
107	10.2.187.168/30	10.2.187.169 – 10.2.187.170	10.2.187.171
108	10.2.187.172/30	10.2.187.173 – 10.2.187.174	10.2.187.175
109	10.2.187.176/30	10.2.187.177 – 10.2.187.178	10.2.187.179
110	10.2.187.180/30	10.2.187.181 – 10.2.187.182	10.2.187.183
111	10.2.187.184/30	10.2.187.185 – 10.2.187.186	10.2.187.187
112	10.2.187.188/30	10.2.187.189 – 10.2.187.190	10.2.187.191
113	10.2.187.192/30	10.2.187.193 – 10.2.187.194	10.2.187.195
114	10.2.187.196/30	10.2.187.197 – 10.2.187.198	10.2.187.199
115	10.2.187.200/30	10.2.187.201 – 10.2.187.202	10.2.187.203
116	10.2.187.204/30	10.2.187.205 – 10.2.187.206	10.2.187.207
117	10.2.187.208/30	10.2.187.209 – 10.2.187.210	10.2.187.211
118	10.2.187.212/30	10.2.187.213 – 10.2.187.214	10.2.187.215
119	10.2.187.216/30	10.2.187.217 – 10.2.187.218	10.2.187.219
120	10.2.187.220/30	10.2.187.221 – 10.2.187.222	10.2.187.223
121	10.2.187.224/30	10.2.187.225 – 10.2.187.226	10.2.187.227
122	10.2.187.228/30	10.2.187.229 – 10.2.187.230	10.2.187.231
123	10.2.187.232/30	10.2.187.233 – 10.2.187.234	10.2.187.235
124	10.2.187.236/30	10.2.187.237 – 10.2.187.238	10.2.187.239
125	10.2.187.240/30	10.2.187.241 – 10.2.187.242	10.2.187.243
126	10.2.187.244/30	10.2.187.245 – 10.2.187.246	10.2.187.247
127	10.2.187.248/30	10.2.187.249 – 10.2.187.250	10.2.187.251
128	10.2.187.252/30	10.2.187.253 – 10.2.187.254	10.2.187.255

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 →