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)10.2.86.0/23

network10.2.86.0/23

broadcast10.2.87.255

first host10.2.86.1

last host10.2.87.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.86.0/23

address00001010.00000010.01010110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.01010110.00000000

broadcast00001010.00000010.01010111.11111111

green = network part, grey = host part

hex0x0a025600

decimal167925248

reverse dns0.86.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:5600

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.86.0/30	10.2.86.1 – 10.2.86.2	10.2.86.3
2	10.2.86.4/30	10.2.86.5 – 10.2.86.6	10.2.86.7
3	10.2.86.8/30	10.2.86.9 – 10.2.86.10	10.2.86.11
4	10.2.86.12/30	10.2.86.13 – 10.2.86.14	10.2.86.15
5	10.2.86.16/30	10.2.86.17 – 10.2.86.18	10.2.86.19
6	10.2.86.20/30	10.2.86.21 – 10.2.86.22	10.2.86.23
7	10.2.86.24/30	10.2.86.25 – 10.2.86.26	10.2.86.27
8	10.2.86.28/30	10.2.86.29 – 10.2.86.30	10.2.86.31
9	10.2.86.32/30	10.2.86.33 – 10.2.86.34	10.2.86.35
10	10.2.86.36/30	10.2.86.37 – 10.2.86.38	10.2.86.39
11	10.2.86.40/30	10.2.86.41 – 10.2.86.42	10.2.86.43
12	10.2.86.44/30	10.2.86.45 – 10.2.86.46	10.2.86.47
13	10.2.86.48/30	10.2.86.49 – 10.2.86.50	10.2.86.51
14	10.2.86.52/30	10.2.86.53 – 10.2.86.54	10.2.86.55
15	10.2.86.56/30	10.2.86.57 – 10.2.86.58	10.2.86.59
16	10.2.86.60/30	10.2.86.61 – 10.2.86.62	10.2.86.63
17	10.2.86.64/30	10.2.86.65 – 10.2.86.66	10.2.86.67
18	10.2.86.68/30	10.2.86.69 – 10.2.86.70	10.2.86.71
19	10.2.86.72/30	10.2.86.73 – 10.2.86.74	10.2.86.75
20	10.2.86.76/30	10.2.86.77 – 10.2.86.78	10.2.86.79
21	10.2.86.80/30	10.2.86.81 – 10.2.86.82	10.2.86.83
22	10.2.86.84/30	10.2.86.85 – 10.2.86.86	10.2.86.87
23	10.2.86.88/30	10.2.86.89 – 10.2.86.90	10.2.86.91
24	10.2.86.92/30	10.2.86.93 – 10.2.86.94	10.2.86.95
25	10.2.86.96/30	10.2.86.97 – 10.2.86.98	10.2.86.99
26	10.2.86.100/30	10.2.86.101 – 10.2.86.102	10.2.86.103
27	10.2.86.104/30	10.2.86.105 – 10.2.86.106	10.2.86.107
28	10.2.86.108/30	10.2.86.109 – 10.2.86.110	10.2.86.111
29	10.2.86.112/30	10.2.86.113 – 10.2.86.114	10.2.86.115
30	10.2.86.116/30	10.2.86.117 – 10.2.86.118	10.2.86.119
31	10.2.86.120/30	10.2.86.121 – 10.2.86.122	10.2.86.123
32	10.2.86.124/30	10.2.86.125 – 10.2.86.126	10.2.86.127
33	10.2.86.128/30	10.2.86.129 – 10.2.86.130	10.2.86.131
34	10.2.86.132/30	10.2.86.133 – 10.2.86.134	10.2.86.135
35	10.2.86.136/30	10.2.86.137 – 10.2.86.138	10.2.86.139
36	10.2.86.140/30	10.2.86.141 – 10.2.86.142	10.2.86.143
37	10.2.86.144/30	10.2.86.145 – 10.2.86.146	10.2.86.147
38	10.2.86.148/30	10.2.86.149 – 10.2.86.150	10.2.86.151
39	10.2.86.152/30	10.2.86.153 – 10.2.86.154	10.2.86.155
40	10.2.86.156/30	10.2.86.157 – 10.2.86.158	10.2.86.159
41	10.2.86.160/30	10.2.86.161 – 10.2.86.162	10.2.86.163
42	10.2.86.164/30	10.2.86.165 – 10.2.86.166	10.2.86.167
43	10.2.86.168/30	10.2.86.169 – 10.2.86.170	10.2.86.171
44	10.2.86.172/30	10.2.86.173 – 10.2.86.174	10.2.86.175
45	10.2.86.176/30	10.2.86.177 – 10.2.86.178	10.2.86.179
46	10.2.86.180/30	10.2.86.181 – 10.2.86.182	10.2.86.183
47	10.2.86.184/30	10.2.86.185 – 10.2.86.186	10.2.86.187
48	10.2.86.188/30	10.2.86.189 – 10.2.86.190	10.2.86.191
49	10.2.86.192/30	10.2.86.193 – 10.2.86.194	10.2.86.195
50	10.2.86.196/30	10.2.86.197 – 10.2.86.198	10.2.86.199
51	10.2.86.200/30	10.2.86.201 – 10.2.86.202	10.2.86.203
52	10.2.86.204/30	10.2.86.205 – 10.2.86.206	10.2.86.207
53	10.2.86.208/30	10.2.86.209 – 10.2.86.210	10.2.86.211
54	10.2.86.212/30	10.2.86.213 – 10.2.86.214	10.2.86.215
55	10.2.86.216/30	10.2.86.217 – 10.2.86.218	10.2.86.219
56	10.2.86.220/30	10.2.86.221 – 10.2.86.222	10.2.86.223
57	10.2.86.224/30	10.2.86.225 – 10.2.86.226	10.2.86.227
58	10.2.86.228/30	10.2.86.229 – 10.2.86.230	10.2.86.231
59	10.2.86.232/30	10.2.86.233 – 10.2.86.234	10.2.86.235
60	10.2.86.236/30	10.2.86.237 – 10.2.86.238	10.2.86.239
61	10.2.86.240/30	10.2.86.241 – 10.2.86.242	10.2.86.243
62	10.2.86.244/30	10.2.86.245 – 10.2.86.246	10.2.86.247
63	10.2.86.248/30	10.2.86.249 – 10.2.86.250	10.2.86.251
64	10.2.86.252/30	10.2.86.253 – 10.2.86.254	10.2.86.255
65	10.2.87.0/30	10.2.87.1 – 10.2.87.2	10.2.87.3
66	10.2.87.4/30	10.2.87.5 – 10.2.87.6	10.2.87.7
67	10.2.87.8/30	10.2.87.9 – 10.2.87.10	10.2.87.11
68	10.2.87.12/30	10.2.87.13 – 10.2.87.14	10.2.87.15
69	10.2.87.16/30	10.2.87.17 – 10.2.87.18	10.2.87.19
70	10.2.87.20/30	10.2.87.21 – 10.2.87.22	10.2.87.23
71	10.2.87.24/30	10.2.87.25 – 10.2.87.26	10.2.87.27
72	10.2.87.28/30	10.2.87.29 – 10.2.87.30	10.2.87.31
73	10.2.87.32/30	10.2.87.33 – 10.2.87.34	10.2.87.35
74	10.2.87.36/30	10.2.87.37 – 10.2.87.38	10.2.87.39
75	10.2.87.40/30	10.2.87.41 – 10.2.87.42	10.2.87.43
76	10.2.87.44/30	10.2.87.45 – 10.2.87.46	10.2.87.47
77	10.2.87.48/30	10.2.87.49 – 10.2.87.50	10.2.87.51
78	10.2.87.52/30	10.2.87.53 – 10.2.87.54	10.2.87.55
79	10.2.87.56/30	10.2.87.57 – 10.2.87.58	10.2.87.59
80	10.2.87.60/30	10.2.87.61 – 10.2.87.62	10.2.87.63
81	10.2.87.64/30	10.2.87.65 – 10.2.87.66	10.2.87.67
82	10.2.87.68/30	10.2.87.69 – 10.2.87.70	10.2.87.71
83	10.2.87.72/30	10.2.87.73 – 10.2.87.74	10.2.87.75
84	10.2.87.76/30	10.2.87.77 – 10.2.87.78	10.2.87.79
85	10.2.87.80/30	10.2.87.81 – 10.2.87.82	10.2.87.83
86	10.2.87.84/30	10.2.87.85 – 10.2.87.86	10.2.87.87
87	10.2.87.88/30	10.2.87.89 – 10.2.87.90	10.2.87.91
88	10.2.87.92/30	10.2.87.93 – 10.2.87.94	10.2.87.95
89	10.2.87.96/30	10.2.87.97 – 10.2.87.98	10.2.87.99
90	10.2.87.100/30	10.2.87.101 – 10.2.87.102	10.2.87.103
91	10.2.87.104/30	10.2.87.105 – 10.2.87.106	10.2.87.107
92	10.2.87.108/30	10.2.87.109 – 10.2.87.110	10.2.87.111
93	10.2.87.112/30	10.2.87.113 – 10.2.87.114	10.2.87.115
94	10.2.87.116/30	10.2.87.117 – 10.2.87.118	10.2.87.119
95	10.2.87.120/30	10.2.87.121 – 10.2.87.122	10.2.87.123
96	10.2.87.124/30	10.2.87.125 – 10.2.87.126	10.2.87.127
97	10.2.87.128/30	10.2.87.129 – 10.2.87.130	10.2.87.131
98	10.2.87.132/30	10.2.87.133 – 10.2.87.134	10.2.87.135
99	10.2.87.136/30	10.2.87.137 – 10.2.87.138	10.2.87.139
100	10.2.87.140/30	10.2.87.141 – 10.2.87.142	10.2.87.143
101	10.2.87.144/30	10.2.87.145 – 10.2.87.146	10.2.87.147
102	10.2.87.148/30	10.2.87.149 – 10.2.87.150	10.2.87.151
103	10.2.87.152/30	10.2.87.153 – 10.2.87.154	10.2.87.155
104	10.2.87.156/30	10.2.87.157 – 10.2.87.158	10.2.87.159
105	10.2.87.160/30	10.2.87.161 – 10.2.87.162	10.2.87.163
106	10.2.87.164/30	10.2.87.165 – 10.2.87.166	10.2.87.167
107	10.2.87.168/30	10.2.87.169 – 10.2.87.170	10.2.87.171
108	10.2.87.172/30	10.2.87.173 – 10.2.87.174	10.2.87.175
109	10.2.87.176/30	10.2.87.177 – 10.2.87.178	10.2.87.179
110	10.2.87.180/30	10.2.87.181 – 10.2.87.182	10.2.87.183
111	10.2.87.184/30	10.2.87.185 – 10.2.87.186	10.2.87.187
112	10.2.87.188/30	10.2.87.189 – 10.2.87.190	10.2.87.191
113	10.2.87.192/30	10.2.87.193 – 10.2.87.194	10.2.87.195
114	10.2.87.196/30	10.2.87.197 – 10.2.87.198	10.2.87.199
115	10.2.87.200/30	10.2.87.201 – 10.2.87.202	10.2.87.203
116	10.2.87.204/30	10.2.87.205 – 10.2.87.206	10.2.87.207
117	10.2.87.208/30	10.2.87.209 – 10.2.87.210	10.2.87.211
118	10.2.87.212/30	10.2.87.213 – 10.2.87.214	10.2.87.215
119	10.2.87.216/30	10.2.87.217 – 10.2.87.218	10.2.87.219
120	10.2.87.220/30	10.2.87.221 – 10.2.87.222	10.2.87.223
121	10.2.87.224/30	10.2.87.225 – 10.2.87.226	10.2.87.227
122	10.2.87.228/30	10.2.87.229 – 10.2.87.230	10.2.87.231
123	10.2.87.232/30	10.2.87.233 – 10.2.87.234	10.2.87.235
124	10.2.87.236/30	10.2.87.237 – 10.2.87.238	10.2.87.239
125	10.2.87.240/30	10.2.87.241 – 10.2.87.242	10.2.87.243
126	10.2.87.244/30	10.2.87.245 – 10.2.87.246	10.2.87.247
127	10.2.87.248/30	10.2.87.249 – 10.2.87.250	10.2.87.251
128	10.2.87.252/30	10.2.87.253 – 10.2.87.254	10.2.87.255

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 →