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)10.85.0.0/23

network10.85.0.0/23

broadcast10.85.1.255

first host10.85.0.1

last host10.85.1.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.85.0.0/23

address00001010.01010101.00000000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01010101.00000000.00000000

broadcast00001010.01010101.00000001.11111111

green = network part, grey = host part

hex0x0a550000

decimal173342720

reverse dns0.0.85.10.in-addr.arpa

ipv4-mapped::ffff:a55:0

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.85.0.0/30	10.85.0.1 – 10.85.0.2	10.85.0.3
2	10.85.0.4/30	10.85.0.5 – 10.85.0.6	10.85.0.7
3	10.85.0.8/30	10.85.0.9 – 10.85.0.10	10.85.0.11
4	10.85.0.12/30	10.85.0.13 – 10.85.0.14	10.85.0.15
5	10.85.0.16/30	10.85.0.17 – 10.85.0.18	10.85.0.19
6	10.85.0.20/30	10.85.0.21 – 10.85.0.22	10.85.0.23
7	10.85.0.24/30	10.85.0.25 – 10.85.0.26	10.85.0.27
8	10.85.0.28/30	10.85.0.29 – 10.85.0.30	10.85.0.31
9	10.85.0.32/30	10.85.0.33 – 10.85.0.34	10.85.0.35
10	10.85.0.36/30	10.85.0.37 – 10.85.0.38	10.85.0.39
11	10.85.0.40/30	10.85.0.41 – 10.85.0.42	10.85.0.43
12	10.85.0.44/30	10.85.0.45 – 10.85.0.46	10.85.0.47
13	10.85.0.48/30	10.85.0.49 – 10.85.0.50	10.85.0.51
14	10.85.0.52/30	10.85.0.53 – 10.85.0.54	10.85.0.55
15	10.85.0.56/30	10.85.0.57 – 10.85.0.58	10.85.0.59
16	10.85.0.60/30	10.85.0.61 – 10.85.0.62	10.85.0.63
17	10.85.0.64/30	10.85.0.65 – 10.85.0.66	10.85.0.67
18	10.85.0.68/30	10.85.0.69 – 10.85.0.70	10.85.0.71
19	10.85.0.72/30	10.85.0.73 – 10.85.0.74	10.85.0.75
20	10.85.0.76/30	10.85.0.77 – 10.85.0.78	10.85.0.79
21	10.85.0.80/30	10.85.0.81 – 10.85.0.82	10.85.0.83
22	10.85.0.84/30	10.85.0.85 – 10.85.0.86	10.85.0.87
23	10.85.0.88/30	10.85.0.89 – 10.85.0.90	10.85.0.91
24	10.85.0.92/30	10.85.0.93 – 10.85.0.94	10.85.0.95
25	10.85.0.96/30	10.85.0.97 – 10.85.0.98	10.85.0.99
26	10.85.0.100/30	10.85.0.101 – 10.85.0.102	10.85.0.103
27	10.85.0.104/30	10.85.0.105 – 10.85.0.106	10.85.0.107
28	10.85.0.108/30	10.85.0.109 – 10.85.0.110	10.85.0.111
29	10.85.0.112/30	10.85.0.113 – 10.85.0.114	10.85.0.115
30	10.85.0.116/30	10.85.0.117 – 10.85.0.118	10.85.0.119
31	10.85.0.120/30	10.85.0.121 – 10.85.0.122	10.85.0.123
32	10.85.0.124/30	10.85.0.125 – 10.85.0.126	10.85.0.127
33	10.85.0.128/30	10.85.0.129 – 10.85.0.130	10.85.0.131
34	10.85.0.132/30	10.85.0.133 – 10.85.0.134	10.85.0.135
35	10.85.0.136/30	10.85.0.137 – 10.85.0.138	10.85.0.139
36	10.85.0.140/30	10.85.0.141 – 10.85.0.142	10.85.0.143
37	10.85.0.144/30	10.85.0.145 – 10.85.0.146	10.85.0.147
38	10.85.0.148/30	10.85.0.149 – 10.85.0.150	10.85.0.151
39	10.85.0.152/30	10.85.0.153 – 10.85.0.154	10.85.0.155
40	10.85.0.156/30	10.85.0.157 – 10.85.0.158	10.85.0.159
41	10.85.0.160/30	10.85.0.161 – 10.85.0.162	10.85.0.163
42	10.85.0.164/30	10.85.0.165 – 10.85.0.166	10.85.0.167
43	10.85.0.168/30	10.85.0.169 – 10.85.0.170	10.85.0.171
44	10.85.0.172/30	10.85.0.173 – 10.85.0.174	10.85.0.175
45	10.85.0.176/30	10.85.0.177 – 10.85.0.178	10.85.0.179
46	10.85.0.180/30	10.85.0.181 – 10.85.0.182	10.85.0.183
47	10.85.0.184/30	10.85.0.185 – 10.85.0.186	10.85.0.187
48	10.85.0.188/30	10.85.0.189 – 10.85.0.190	10.85.0.191
49	10.85.0.192/30	10.85.0.193 – 10.85.0.194	10.85.0.195
50	10.85.0.196/30	10.85.0.197 – 10.85.0.198	10.85.0.199
51	10.85.0.200/30	10.85.0.201 – 10.85.0.202	10.85.0.203
52	10.85.0.204/30	10.85.0.205 – 10.85.0.206	10.85.0.207
53	10.85.0.208/30	10.85.0.209 – 10.85.0.210	10.85.0.211
54	10.85.0.212/30	10.85.0.213 – 10.85.0.214	10.85.0.215
55	10.85.0.216/30	10.85.0.217 – 10.85.0.218	10.85.0.219
56	10.85.0.220/30	10.85.0.221 – 10.85.0.222	10.85.0.223
57	10.85.0.224/30	10.85.0.225 – 10.85.0.226	10.85.0.227
58	10.85.0.228/30	10.85.0.229 – 10.85.0.230	10.85.0.231
59	10.85.0.232/30	10.85.0.233 – 10.85.0.234	10.85.0.235
60	10.85.0.236/30	10.85.0.237 – 10.85.0.238	10.85.0.239
61	10.85.0.240/30	10.85.0.241 – 10.85.0.242	10.85.0.243
62	10.85.0.244/30	10.85.0.245 – 10.85.0.246	10.85.0.247
63	10.85.0.248/30	10.85.0.249 – 10.85.0.250	10.85.0.251
64	10.85.0.252/30	10.85.0.253 – 10.85.0.254	10.85.0.255
65	10.85.1.0/30	10.85.1.1 – 10.85.1.2	10.85.1.3
66	10.85.1.4/30	10.85.1.5 – 10.85.1.6	10.85.1.7
67	10.85.1.8/30	10.85.1.9 – 10.85.1.10	10.85.1.11
68	10.85.1.12/30	10.85.1.13 – 10.85.1.14	10.85.1.15
69	10.85.1.16/30	10.85.1.17 – 10.85.1.18	10.85.1.19
70	10.85.1.20/30	10.85.1.21 – 10.85.1.22	10.85.1.23
71	10.85.1.24/30	10.85.1.25 – 10.85.1.26	10.85.1.27
72	10.85.1.28/30	10.85.1.29 – 10.85.1.30	10.85.1.31
73	10.85.1.32/30	10.85.1.33 – 10.85.1.34	10.85.1.35
74	10.85.1.36/30	10.85.1.37 – 10.85.1.38	10.85.1.39
75	10.85.1.40/30	10.85.1.41 – 10.85.1.42	10.85.1.43
76	10.85.1.44/30	10.85.1.45 – 10.85.1.46	10.85.1.47
77	10.85.1.48/30	10.85.1.49 – 10.85.1.50	10.85.1.51
78	10.85.1.52/30	10.85.1.53 – 10.85.1.54	10.85.1.55
79	10.85.1.56/30	10.85.1.57 – 10.85.1.58	10.85.1.59
80	10.85.1.60/30	10.85.1.61 – 10.85.1.62	10.85.1.63
81	10.85.1.64/30	10.85.1.65 – 10.85.1.66	10.85.1.67
82	10.85.1.68/30	10.85.1.69 – 10.85.1.70	10.85.1.71
83	10.85.1.72/30	10.85.1.73 – 10.85.1.74	10.85.1.75
84	10.85.1.76/30	10.85.1.77 – 10.85.1.78	10.85.1.79
85	10.85.1.80/30	10.85.1.81 – 10.85.1.82	10.85.1.83
86	10.85.1.84/30	10.85.1.85 – 10.85.1.86	10.85.1.87
87	10.85.1.88/30	10.85.1.89 – 10.85.1.90	10.85.1.91
88	10.85.1.92/30	10.85.1.93 – 10.85.1.94	10.85.1.95
89	10.85.1.96/30	10.85.1.97 – 10.85.1.98	10.85.1.99
90	10.85.1.100/30	10.85.1.101 – 10.85.1.102	10.85.1.103
91	10.85.1.104/30	10.85.1.105 – 10.85.1.106	10.85.1.107
92	10.85.1.108/30	10.85.1.109 – 10.85.1.110	10.85.1.111
93	10.85.1.112/30	10.85.1.113 – 10.85.1.114	10.85.1.115
94	10.85.1.116/30	10.85.1.117 – 10.85.1.118	10.85.1.119
95	10.85.1.120/30	10.85.1.121 – 10.85.1.122	10.85.1.123
96	10.85.1.124/30	10.85.1.125 – 10.85.1.126	10.85.1.127
97	10.85.1.128/30	10.85.1.129 – 10.85.1.130	10.85.1.131
98	10.85.1.132/30	10.85.1.133 – 10.85.1.134	10.85.1.135
99	10.85.1.136/30	10.85.1.137 – 10.85.1.138	10.85.1.139
100	10.85.1.140/30	10.85.1.141 – 10.85.1.142	10.85.1.143
101	10.85.1.144/30	10.85.1.145 – 10.85.1.146	10.85.1.147
102	10.85.1.148/30	10.85.1.149 – 10.85.1.150	10.85.1.151
103	10.85.1.152/30	10.85.1.153 – 10.85.1.154	10.85.1.155
104	10.85.1.156/30	10.85.1.157 – 10.85.1.158	10.85.1.159
105	10.85.1.160/30	10.85.1.161 – 10.85.1.162	10.85.1.163
106	10.85.1.164/30	10.85.1.165 – 10.85.1.166	10.85.1.167
107	10.85.1.168/30	10.85.1.169 – 10.85.1.170	10.85.1.171
108	10.85.1.172/30	10.85.1.173 – 10.85.1.174	10.85.1.175
109	10.85.1.176/30	10.85.1.177 – 10.85.1.178	10.85.1.179
110	10.85.1.180/30	10.85.1.181 – 10.85.1.182	10.85.1.183
111	10.85.1.184/30	10.85.1.185 – 10.85.1.186	10.85.1.187
112	10.85.1.188/30	10.85.1.189 – 10.85.1.190	10.85.1.191
113	10.85.1.192/30	10.85.1.193 – 10.85.1.194	10.85.1.195
114	10.85.1.196/30	10.85.1.197 – 10.85.1.198	10.85.1.199
115	10.85.1.200/30	10.85.1.201 – 10.85.1.202	10.85.1.203
116	10.85.1.204/30	10.85.1.205 – 10.85.1.206	10.85.1.207
117	10.85.1.208/30	10.85.1.209 – 10.85.1.210	10.85.1.211
118	10.85.1.212/30	10.85.1.213 – 10.85.1.214	10.85.1.215
119	10.85.1.216/30	10.85.1.217 – 10.85.1.218	10.85.1.219
120	10.85.1.220/30	10.85.1.221 – 10.85.1.222	10.85.1.223
121	10.85.1.224/30	10.85.1.225 – 10.85.1.226	10.85.1.227
122	10.85.1.228/30	10.85.1.229 – 10.85.1.230	10.85.1.231
123	10.85.1.232/30	10.85.1.233 – 10.85.1.234	10.85.1.235
124	10.85.1.236/30	10.85.1.237 – 10.85.1.238	10.85.1.239
125	10.85.1.240/30	10.85.1.241 – 10.85.1.242	10.85.1.243
126	10.85.1.244/30	10.85.1.245 – 10.85.1.246	10.85.1.247
127	10.85.1.248/30	10.85.1.249 – 10.85.1.250	10.85.1.251
128	10.85.1.252/30	10.85.1.253 – 10.85.1.254	10.85.1.255

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 →