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)10.91.80.0/24

network10.91.80.0/24

broadcast10.91.80.255

first host10.91.80.1

last host10.91.80.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.91.80.0/24

address00001010.01011011.01010000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01011011.01010000.00000000

broadcast00001010.01011011.01010000.11111111

green = network part, grey = host part

hex0x0a5b5000

decimal173756416

reverse dns0.80.91.10.in-addr.arpa

ipv4-mapped::ffff:a5b:5000

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.91.80.0/31	10.91.80.0 – 10.91.80.1	10.91.80.1
2	10.91.80.2/31	10.91.80.2 – 10.91.80.3	10.91.80.3
3	10.91.80.4/31	10.91.80.4 – 10.91.80.5	10.91.80.5
4	10.91.80.6/31	10.91.80.6 – 10.91.80.7	10.91.80.7
5	10.91.80.8/31	10.91.80.8 – 10.91.80.9	10.91.80.9
6	10.91.80.10/31	10.91.80.10 – 10.91.80.11	10.91.80.11
7	10.91.80.12/31	10.91.80.12 – 10.91.80.13	10.91.80.13
8	10.91.80.14/31	10.91.80.14 – 10.91.80.15	10.91.80.15
9	10.91.80.16/31	10.91.80.16 – 10.91.80.17	10.91.80.17
10	10.91.80.18/31	10.91.80.18 – 10.91.80.19	10.91.80.19
11	10.91.80.20/31	10.91.80.20 – 10.91.80.21	10.91.80.21
12	10.91.80.22/31	10.91.80.22 – 10.91.80.23	10.91.80.23
13	10.91.80.24/31	10.91.80.24 – 10.91.80.25	10.91.80.25
14	10.91.80.26/31	10.91.80.26 – 10.91.80.27	10.91.80.27
15	10.91.80.28/31	10.91.80.28 – 10.91.80.29	10.91.80.29
16	10.91.80.30/31	10.91.80.30 – 10.91.80.31	10.91.80.31
17	10.91.80.32/31	10.91.80.32 – 10.91.80.33	10.91.80.33
18	10.91.80.34/31	10.91.80.34 – 10.91.80.35	10.91.80.35
19	10.91.80.36/31	10.91.80.36 – 10.91.80.37	10.91.80.37
20	10.91.80.38/31	10.91.80.38 – 10.91.80.39	10.91.80.39
21	10.91.80.40/31	10.91.80.40 – 10.91.80.41	10.91.80.41
22	10.91.80.42/31	10.91.80.42 – 10.91.80.43	10.91.80.43
23	10.91.80.44/31	10.91.80.44 – 10.91.80.45	10.91.80.45
24	10.91.80.46/31	10.91.80.46 – 10.91.80.47	10.91.80.47
25	10.91.80.48/31	10.91.80.48 – 10.91.80.49	10.91.80.49
26	10.91.80.50/31	10.91.80.50 – 10.91.80.51	10.91.80.51
27	10.91.80.52/31	10.91.80.52 – 10.91.80.53	10.91.80.53
28	10.91.80.54/31	10.91.80.54 – 10.91.80.55	10.91.80.55
29	10.91.80.56/31	10.91.80.56 – 10.91.80.57	10.91.80.57
30	10.91.80.58/31	10.91.80.58 – 10.91.80.59	10.91.80.59
31	10.91.80.60/31	10.91.80.60 – 10.91.80.61	10.91.80.61
32	10.91.80.62/31	10.91.80.62 – 10.91.80.63	10.91.80.63
33	10.91.80.64/31	10.91.80.64 – 10.91.80.65	10.91.80.65
34	10.91.80.66/31	10.91.80.66 – 10.91.80.67	10.91.80.67
35	10.91.80.68/31	10.91.80.68 – 10.91.80.69	10.91.80.69
36	10.91.80.70/31	10.91.80.70 – 10.91.80.71	10.91.80.71
37	10.91.80.72/31	10.91.80.72 – 10.91.80.73	10.91.80.73
38	10.91.80.74/31	10.91.80.74 – 10.91.80.75	10.91.80.75
39	10.91.80.76/31	10.91.80.76 – 10.91.80.77	10.91.80.77
40	10.91.80.78/31	10.91.80.78 – 10.91.80.79	10.91.80.79
41	10.91.80.80/31	10.91.80.80 – 10.91.80.81	10.91.80.81
42	10.91.80.82/31	10.91.80.82 – 10.91.80.83	10.91.80.83
43	10.91.80.84/31	10.91.80.84 – 10.91.80.85	10.91.80.85
44	10.91.80.86/31	10.91.80.86 – 10.91.80.87	10.91.80.87
45	10.91.80.88/31	10.91.80.88 – 10.91.80.89	10.91.80.89
46	10.91.80.90/31	10.91.80.90 – 10.91.80.91	10.91.80.91
47	10.91.80.92/31	10.91.80.92 – 10.91.80.93	10.91.80.93
48	10.91.80.94/31	10.91.80.94 – 10.91.80.95	10.91.80.95
49	10.91.80.96/31	10.91.80.96 – 10.91.80.97	10.91.80.97
50	10.91.80.98/31	10.91.80.98 – 10.91.80.99	10.91.80.99
51	10.91.80.100/31	10.91.80.100 – 10.91.80.101	10.91.80.101
52	10.91.80.102/31	10.91.80.102 – 10.91.80.103	10.91.80.103
53	10.91.80.104/31	10.91.80.104 – 10.91.80.105	10.91.80.105
54	10.91.80.106/31	10.91.80.106 – 10.91.80.107	10.91.80.107
55	10.91.80.108/31	10.91.80.108 – 10.91.80.109	10.91.80.109
56	10.91.80.110/31	10.91.80.110 – 10.91.80.111	10.91.80.111
57	10.91.80.112/31	10.91.80.112 – 10.91.80.113	10.91.80.113
58	10.91.80.114/31	10.91.80.114 – 10.91.80.115	10.91.80.115
59	10.91.80.116/31	10.91.80.116 – 10.91.80.117	10.91.80.117
60	10.91.80.118/31	10.91.80.118 – 10.91.80.119	10.91.80.119
61	10.91.80.120/31	10.91.80.120 – 10.91.80.121	10.91.80.121
62	10.91.80.122/31	10.91.80.122 – 10.91.80.123	10.91.80.123
63	10.91.80.124/31	10.91.80.124 – 10.91.80.125	10.91.80.125
64	10.91.80.126/31	10.91.80.126 – 10.91.80.127	10.91.80.127
65	10.91.80.128/31	10.91.80.128 – 10.91.80.129	10.91.80.129
66	10.91.80.130/31	10.91.80.130 – 10.91.80.131	10.91.80.131
67	10.91.80.132/31	10.91.80.132 – 10.91.80.133	10.91.80.133
68	10.91.80.134/31	10.91.80.134 – 10.91.80.135	10.91.80.135
69	10.91.80.136/31	10.91.80.136 – 10.91.80.137	10.91.80.137
70	10.91.80.138/31	10.91.80.138 – 10.91.80.139	10.91.80.139
71	10.91.80.140/31	10.91.80.140 – 10.91.80.141	10.91.80.141
72	10.91.80.142/31	10.91.80.142 – 10.91.80.143	10.91.80.143
73	10.91.80.144/31	10.91.80.144 – 10.91.80.145	10.91.80.145
74	10.91.80.146/31	10.91.80.146 – 10.91.80.147	10.91.80.147
75	10.91.80.148/31	10.91.80.148 – 10.91.80.149	10.91.80.149
76	10.91.80.150/31	10.91.80.150 – 10.91.80.151	10.91.80.151
77	10.91.80.152/31	10.91.80.152 – 10.91.80.153	10.91.80.153
78	10.91.80.154/31	10.91.80.154 – 10.91.80.155	10.91.80.155
79	10.91.80.156/31	10.91.80.156 – 10.91.80.157	10.91.80.157
80	10.91.80.158/31	10.91.80.158 – 10.91.80.159	10.91.80.159
81	10.91.80.160/31	10.91.80.160 – 10.91.80.161	10.91.80.161
82	10.91.80.162/31	10.91.80.162 – 10.91.80.163	10.91.80.163
83	10.91.80.164/31	10.91.80.164 – 10.91.80.165	10.91.80.165
84	10.91.80.166/31	10.91.80.166 – 10.91.80.167	10.91.80.167
85	10.91.80.168/31	10.91.80.168 – 10.91.80.169	10.91.80.169
86	10.91.80.170/31	10.91.80.170 – 10.91.80.171	10.91.80.171
87	10.91.80.172/31	10.91.80.172 – 10.91.80.173	10.91.80.173
88	10.91.80.174/31	10.91.80.174 – 10.91.80.175	10.91.80.175
89	10.91.80.176/31	10.91.80.176 – 10.91.80.177	10.91.80.177
90	10.91.80.178/31	10.91.80.178 – 10.91.80.179	10.91.80.179
91	10.91.80.180/31	10.91.80.180 – 10.91.80.181	10.91.80.181
92	10.91.80.182/31	10.91.80.182 – 10.91.80.183	10.91.80.183
93	10.91.80.184/31	10.91.80.184 – 10.91.80.185	10.91.80.185
94	10.91.80.186/31	10.91.80.186 – 10.91.80.187	10.91.80.187
95	10.91.80.188/31	10.91.80.188 – 10.91.80.189	10.91.80.189
96	10.91.80.190/31	10.91.80.190 – 10.91.80.191	10.91.80.191
97	10.91.80.192/31	10.91.80.192 – 10.91.80.193	10.91.80.193
98	10.91.80.194/31	10.91.80.194 – 10.91.80.195	10.91.80.195
99	10.91.80.196/31	10.91.80.196 – 10.91.80.197	10.91.80.197
100	10.91.80.198/31	10.91.80.198 – 10.91.80.199	10.91.80.199
101	10.91.80.200/31	10.91.80.200 – 10.91.80.201	10.91.80.201
102	10.91.80.202/31	10.91.80.202 – 10.91.80.203	10.91.80.203
103	10.91.80.204/31	10.91.80.204 – 10.91.80.205	10.91.80.205
104	10.91.80.206/31	10.91.80.206 – 10.91.80.207	10.91.80.207
105	10.91.80.208/31	10.91.80.208 – 10.91.80.209	10.91.80.209
106	10.91.80.210/31	10.91.80.210 – 10.91.80.211	10.91.80.211
107	10.91.80.212/31	10.91.80.212 – 10.91.80.213	10.91.80.213
108	10.91.80.214/31	10.91.80.214 – 10.91.80.215	10.91.80.215
109	10.91.80.216/31	10.91.80.216 – 10.91.80.217	10.91.80.217
110	10.91.80.218/31	10.91.80.218 – 10.91.80.219	10.91.80.219
111	10.91.80.220/31	10.91.80.220 – 10.91.80.221	10.91.80.221
112	10.91.80.222/31	10.91.80.222 – 10.91.80.223	10.91.80.223
113	10.91.80.224/31	10.91.80.224 – 10.91.80.225	10.91.80.225
114	10.91.80.226/31	10.91.80.226 – 10.91.80.227	10.91.80.227
115	10.91.80.228/31	10.91.80.228 – 10.91.80.229	10.91.80.229
116	10.91.80.230/31	10.91.80.230 – 10.91.80.231	10.91.80.231
117	10.91.80.232/31	10.91.80.232 – 10.91.80.233	10.91.80.233
118	10.91.80.234/31	10.91.80.234 – 10.91.80.235	10.91.80.235
119	10.91.80.236/31	10.91.80.236 – 10.91.80.237	10.91.80.237
120	10.91.80.238/31	10.91.80.238 – 10.91.80.239	10.91.80.239
121	10.91.80.240/31	10.91.80.240 – 10.91.80.241	10.91.80.241
122	10.91.80.242/31	10.91.80.242 – 10.91.80.243	10.91.80.243
123	10.91.80.244/31	10.91.80.244 – 10.91.80.245	10.91.80.245
124	10.91.80.246/31	10.91.80.246 – 10.91.80.247	10.91.80.247
125	10.91.80.248/31	10.91.80.248 – 10.91.80.249	10.91.80.249
126	10.91.80.250/31	10.91.80.250 – 10.91.80.251	10.91.80.251
127	10.91.80.252/31	10.91.80.252 – 10.91.80.253	10.91.80.253
128	10.91.80.254/31	10.91.80.254 – 10.91.80.255	10.91.80.255

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 →