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)10.0.85.0/24

network10.0.85.0/24

broadcast10.0.85.255

first host10.0.85.1

last host10.0.85.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.85.0/24

address00001010.00000000.01010101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.01010101.00000000

broadcast00001010.00000000.01010101.11111111

green = network part, grey = host part

hex0x0a005500

decimal167793920

reverse dns0.85.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:5500

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.85.0/31	10.0.85.0 – 10.0.85.1	10.0.85.1
2	10.0.85.2/31	10.0.85.2 – 10.0.85.3	10.0.85.3
3	10.0.85.4/31	10.0.85.4 – 10.0.85.5	10.0.85.5
4	10.0.85.6/31	10.0.85.6 – 10.0.85.7	10.0.85.7
5	10.0.85.8/31	10.0.85.8 – 10.0.85.9	10.0.85.9
6	10.0.85.10/31	10.0.85.10 – 10.0.85.11	10.0.85.11
7	10.0.85.12/31	10.0.85.12 – 10.0.85.13	10.0.85.13
8	10.0.85.14/31	10.0.85.14 – 10.0.85.15	10.0.85.15
9	10.0.85.16/31	10.0.85.16 – 10.0.85.17	10.0.85.17
10	10.0.85.18/31	10.0.85.18 – 10.0.85.19	10.0.85.19
11	10.0.85.20/31	10.0.85.20 – 10.0.85.21	10.0.85.21
12	10.0.85.22/31	10.0.85.22 – 10.0.85.23	10.0.85.23
13	10.0.85.24/31	10.0.85.24 – 10.0.85.25	10.0.85.25
14	10.0.85.26/31	10.0.85.26 – 10.0.85.27	10.0.85.27
15	10.0.85.28/31	10.0.85.28 – 10.0.85.29	10.0.85.29
16	10.0.85.30/31	10.0.85.30 – 10.0.85.31	10.0.85.31
17	10.0.85.32/31	10.0.85.32 – 10.0.85.33	10.0.85.33
18	10.0.85.34/31	10.0.85.34 – 10.0.85.35	10.0.85.35
19	10.0.85.36/31	10.0.85.36 – 10.0.85.37	10.0.85.37
20	10.0.85.38/31	10.0.85.38 – 10.0.85.39	10.0.85.39
21	10.0.85.40/31	10.0.85.40 – 10.0.85.41	10.0.85.41
22	10.0.85.42/31	10.0.85.42 – 10.0.85.43	10.0.85.43
23	10.0.85.44/31	10.0.85.44 – 10.0.85.45	10.0.85.45
24	10.0.85.46/31	10.0.85.46 – 10.0.85.47	10.0.85.47
25	10.0.85.48/31	10.0.85.48 – 10.0.85.49	10.0.85.49
26	10.0.85.50/31	10.0.85.50 – 10.0.85.51	10.0.85.51
27	10.0.85.52/31	10.0.85.52 – 10.0.85.53	10.0.85.53
28	10.0.85.54/31	10.0.85.54 – 10.0.85.55	10.0.85.55
29	10.0.85.56/31	10.0.85.56 – 10.0.85.57	10.0.85.57
30	10.0.85.58/31	10.0.85.58 – 10.0.85.59	10.0.85.59
31	10.0.85.60/31	10.0.85.60 – 10.0.85.61	10.0.85.61
32	10.0.85.62/31	10.0.85.62 – 10.0.85.63	10.0.85.63
33	10.0.85.64/31	10.0.85.64 – 10.0.85.65	10.0.85.65
34	10.0.85.66/31	10.0.85.66 – 10.0.85.67	10.0.85.67
35	10.0.85.68/31	10.0.85.68 – 10.0.85.69	10.0.85.69
36	10.0.85.70/31	10.0.85.70 – 10.0.85.71	10.0.85.71
37	10.0.85.72/31	10.0.85.72 – 10.0.85.73	10.0.85.73
38	10.0.85.74/31	10.0.85.74 – 10.0.85.75	10.0.85.75
39	10.0.85.76/31	10.0.85.76 – 10.0.85.77	10.0.85.77
40	10.0.85.78/31	10.0.85.78 – 10.0.85.79	10.0.85.79
41	10.0.85.80/31	10.0.85.80 – 10.0.85.81	10.0.85.81
42	10.0.85.82/31	10.0.85.82 – 10.0.85.83	10.0.85.83
43	10.0.85.84/31	10.0.85.84 – 10.0.85.85	10.0.85.85
44	10.0.85.86/31	10.0.85.86 – 10.0.85.87	10.0.85.87
45	10.0.85.88/31	10.0.85.88 – 10.0.85.89	10.0.85.89
46	10.0.85.90/31	10.0.85.90 – 10.0.85.91	10.0.85.91
47	10.0.85.92/31	10.0.85.92 – 10.0.85.93	10.0.85.93
48	10.0.85.94/31	10.0.85.94 – 10.0.85.95	10.0.85.95
49	10.0.85.96/31	10.0.85.96 – 10.0.85.97	10.0.85.97
50	10.0.85.98/31	10.0.85.98 – 10.0.85.99	10.0.85.99
51	10.0.85.100/31	10.0.85.100 – 10.0.85.101	10.0.85.101
52	10.0.85.102/31	10.0.85.102 – 10.0.85.103	10.0.85.103
53	10.0.85.104/31	10.0.85.104 – 10.0.85.105	10.0.85.105
54	10.0.85.106/31	10.0.85.106 – 10.0.85.107	10.0.85.107
55	10.0.85.108/31	10.0.85.108 – 10.0.85.109	10.0.85.109
56	10.0.85.110/31	10.0.85.110 – 10.0.85.111	10.0.85.111
57	10.0.85.112/31	10.0.85.112 – 10.0.85.113	10.0.85.113
58	10.0.85.114/31	10.0.85.114 – 10.0.85.115	10.0.85.115
59	10.0.85.116/31	10.0.85.116 – 10.0.85.117	10.0.85.117
60	10.0.85.118/31	10.0.85.118 – 10.0.85.119	10.0.85.119
61	10.0.85.120/31	10.0.85.120 – 10.0.85.121	10.0.85.121
62	10.0.85.122/31	10.0.85.122 – 10.0.85.123	10.0.85.123
63	10.0.85.124/31	10.0.85.124 – 10.0.85.125	10.0.85.125
64	10.0.85.126/31	10.0.85.126 – 10.0.85.127	10.0.85.127
65	10.0.85.128/31	10.0.85.128 – 10.0.85.129	10.0.85.129
66	10.0.85.130/31	10.0.85.130 – 10.0.85.131	10.0.85.131
67	10.0.85.132/31	10.0.85.132 – 10.0.85.133	10.0.85.133
68	10.0.85.134/31	10.0.85.134 – 10.0.85.135	10.0.85.135
69	10.0.85.136/31	10.0.85.136 – 10.0.85.137	10.0.85.137
70	10.0.85.138/31	10.0.85.138 – 10.0.85.139	10.0.85.139
71	10.0.85.140/31	10.0.85.140 – 10.0.85.141	10.0.85.141
72	10.0.85.142/31	10.0.85.142 – 10.0.85.143	10.0.85.143
73	10.0.85.144/31	10.0.85.144 – 10.0.85.145	10.0.85.145
74	10.0.85.146/31	10.0.85.146 – 10.0.85.147	10.0.85.147
75	10.0.85.148/31	10.0.85.148 – 10.0.85.149	10.0.85.149
76	10.0.85.150/31	10.0.85.150 – 10.0.85.151	10.0.85.151
77	10.0.85.152/31	10.0.85.152 – 10.0.85.153	10.0.85.153
78	10.0.85.154/31	10.0.85.154 – 10.0.85.155	10.0.85.155
79	10.0.85.156/31	10.0.85.156 – 10.0.85.157	10.0.85.157
80	10.0.85.158/31	10.0.85.158 – 10.0.85.159	10.0.85.159
81	10.0.85.160/31	10.0.85.160 – 10.0.85.161	10.0.85.161
82	10.0.85.162/31	10.0.85.162 – 10.0.85.163	10.0.85.163
83	10.0.85.164/31	10.0.85.164 – 10.0.85.165	10.0.85.165
84	10.0.85.166/31	10.0.85.166 – 10.0.85.167	10.0.85.167
85	10.0.85.168/31	10.0.85.168 – 10.0.85.169	10.0.85.169
86	10.0.85.170/31	10.0.85.170 – 10.0.85.171	10.0.85.171
87	10.0.85.172/31	10.0.85.172 – 10.0.85.173	10.0.85.173
88	10.0.85.174/31	10.0.85.174 – 10.0.85.175	10.0.85.175
89	10.0.85.176/31	10.0.85.176 – 10.0.85.177	10.0.85.177
90	10.0.85.178/31	10.0.85.178 – 10.0.85.179	10.0.85.179
91	10.0.85.180/31	10.0.85.180 – 10.0.85.181	10.0.85.181
92	10.0.85.182/31	10.0.85.182 – 10.0.85.183	10.0.85.183
93	10.0.85.184/31	10.0.85.184 – 10.0.85.185	10.0.85.185
94	10.0.85.186/31	10.0.85.186 – 10.0.85.187	10.0.85.187
95	10.0.85.188/31	10.0.85.188 – 10.0.85.189	10.0.85.189
96	10.0.85.190/31	10.0.85.190 – 10.0.85.191	10.0.85.191
97	10.0.85.192/31	10.0.85.192 – 10.0.85.193	10.0.85.193
98	10.0.85.194/31	10.0.85.194 – 10.0.85.195	10.0.85.195
99	10.0.85.196/31	10.0.85.196 – 10.0.85.197	10.0.85.197
100	10.0.85.198/31	10.0.85.198 – 10.0.85.199	10.0.85.199
101	10.0.85.200/31	10.0.85.200 – 10.0.85.201	10.0.85.201
102	10.0.85.202/31	10.0.85.202 – 10.0.85.203	10.0.85.203
103	10.0.85.204/31	10.0.85.204 – 10.0.85.205	10.0.85.205
104	10.0.85.206/31	10.0.85.206 – 10.0.85.207	10.0.85.207
105	10.0.85.208/31	10.0.85.208 – 10.0.85.209	10.0.85.209
106	10.0.85.210/31	10.0.85.210 – 10.0.85.211	10.0.85.211
107	10.0.85.212/31	10.0.85.212 – 10.0.85.213	10.0.85.213
108	10.0.85.214/31	10.0.85.214 – 10.0.85.215	10.0.85.215
109	10.0.85.216/31	10.0.85.216 – 10.0.85.217	10.0.85.217
110	10.0.85.218/31	10.0.85.218 – 10.0.85.219	10.0.85.219
111	10.0.85.220/31	10.0.85.220 – 10.0.85.221	10.0.85.221
112	10.0.85.222/31	10.0.85.222 – 10.0.85.223	10.0.85.223
113	10.0.85.224/31	10.0.85.224 – 10.0.85.225	10.0.85.225
114	10.0.85.226/31	10.0.85.226 – 10.0.85.227	10.0.85.227
115	10.0.85.228/31	10.0.85.228 – 10.0.85.229	10.0.85.229
116	10.0.85.230/31	10.0.85.230 – 10.0.85.231	10.0.85.231
117	10.0.85.232/31	10.0.85.232 – 10.0.85.233	10.0.85.233
118	10.0.85.234/31	10.0.85.234 – 10.0.85.235	10.0.85.235
119	10.0.85.236/31	10.0.85.236 – 10.0.85.237	10.0.85.237
120	10.0.85.238/31	10.0.85.238 – 10.0.85.239	10.0.85.239
121	10.0.85.240/31	10.0.85.240 – 10.0.85.241	10.0.85.241
122	10.0.85.242/31	10.0.85.242 – 10.0.85.243	10.0.85.243
123	10.0.85.244/31	10.0.85.244 – 10.0.85.245	10.0.85.245
124	10.0.85.246/31	10.0.85.246 – 10.0.85.247	10.0.85.247
125	10.0.85.248/31	10.0.85.248 – 10.0.85.249	10.0.85.249
126	10.0.85.250/31	10.0.85.250 – 10.0.85.251	10.0.85.251
127	10.0.85.252/31	10.0.85.252 – 10.0.85.253	10.0.85.253
128	10.0.85.254/31	10.0.85.254 – 10.0.85.255	10.0.85.255

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 /24
/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	-
/24	255.255.255.0	256	254	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 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 →