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)10.0.171.0/24

network10.0.171.0/24

broadcast10.0.171.255

first host10.0.171.1

last host10.0.171.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.171.0/24

address00001010.00000000.10101011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.10101011.00000000

broadcast00001010.00000000.10101011.11111111

green = network part, grey = host part

hex0x0a00ab00

decimal167815936

reverse dns0.171.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:ab00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.171.0/31	10.0.171.0 – 10.0.171.1	10.0.171.1
2	10.0.171.2/31	10.0.171.2 – 10.0.171.3	10.0.171.3
3	10.0.171.4/31	10.0.171.4 – 10.0.171.5	10.0.171.5
4	10.0.171.6/31	10.0.171.6 – 10.0.171.7	10.0.171.7
5	10.0.171.8/31	10.0.171.8 – 10.0.171.9	10.0.171.9
6	10.0.171.10/31	10.0.171.10 – 10.0.171.11	10.0.171.11
7	10.0.171.12/31	10.0.171.12 – 10.0.171.13	10.0.171.13
8	10.0.171.14/31	10.0.171.14 – 10.0.171.15	10.0.171.15
9	10.0.171.16/31	10.0.171.16 – 10.0.171.17	10.0.171.17
10	10.0.171.18/31	10.0.171.18 – 10.0.171.19	10.0.171.19
11	10.0.171.20/31	10.0.171.20 – 10.0.171.21	10.0.171.21
12	10.0.171.22/31	10.0.171.22 – 10.0.171.23	10.0.171.23
13	10.0.171.24/31	10.0.171.24 – 10.0.171.25	10.0.171.25
14	10.0.171.26/31	10.0.171.26 – 10.0.171.27	10.0.171.27
15	10.0.171.28/31	10.0.171.28 – 10.0.171.29	10.0.171.29
16	10.0.171.30/31	10.0.171.30 – 10.0.171.31	10.0.171.31
17	10.0.171.32/31	10.0.171.32 – 10.0.171.33	10.0.171.33
18	10.0.171.34/31	10.0.171.34 – 10.0.171.35	10.0.171.35
19	10.0.171.36/31	10.0.171.36 – 10.0.171.37	10.0.171.37
20	10.0.171.38/31	10.0.171.38 – 10.0.171.39	10.0.171.39
21	10.0.171.40/31	10.0.171.40 – 10.0.171.41	10.0.171.41
22	10.0.171.42/31	10.0.171.42 – 10.0.171.43	10.0.171.43
23	10.0.171.44/31	10.0.171.44 – 10.0.171.45	10.0.171.45
24	10.0.171.46/31	10.0.171.46 – 10.0.171.47	10.0.171.47
25	10.0.171.48/31	10.0.171.48 – 10.0.171.49	10.0.171.49
26	10.0.171.50/31	10.0.171.50 – 10.0.171.51	10.0.171.51
27	10.0.171.52/31	10.0.171.52 – 10.0.171.53	10.0.171.53
28	10.0.171.54/31	10.0.171.54 – 10.0.171.55	10.0.171.55
29	10.0.171.56/31	10.0.171.56 – 10.0.171.57	10.0.171.57
30	10.0.171.58/31	10.0.171.58 – 10.0.171.59	10.0.171.59
31	10.0.171.60/31	10.0.171.60 – 10.0.171.61	10.0.171.61
32	10.0.171.62/31	10.0.171.62 – 10.0.171.63	10.0.171.63
33	10.0.171.64/31	10.0.171.64 – 10.0.171.65	10.0.171.65
34	10.0.171.66/31	10.0.171.66 – 10.0.171.67	10.0.171.67
35	10.0.171.68/31	10.0.171.68 – 10.0.171.69	10.0.171.69
36	10.0.171.70/31	10.0.171.70 – 10.0.171.71	10.0.171.71
37	10.0.171.72/31	10.0.171.72 – 10.0.171.73	10.0.171.73
38	10.0.171.74/31	10.0.171.74 – 10.0.171.75	10.0.171.75
39	10.0.171.76/31	10.0.171.76 – 10.0.171.77	10.0.171.77
40	10.0.171.78/31	10.0.171.78 – 10.0.171.79	10.0.171.79
41	10.0.171.80/31	10.0.171.80 – 10.0.171.81	10.0.171.81
42	10.0.171.82/31	10.0.171.82 – 10.0.171.83	10.0.171.83
43	10.0.171.84/31	10.0.171.84 – 10.0.171.85	10.0.171.85
44	10.0.171.86/31	10.0.171.86 – 10.0.171.87	10.0.171.87
45	10.0.171.88/31	10.0.171.88 – 10.0.171.89	10.0.171.89
46	10.0.171.90/31	10.0.171.90 – 10.0.171.91	10.0.171.91
47	10.0.171.92/31	10.0.171.92 – 10.0.171.93	10.0.171.93
48	10.0.171.94/31	10.0.171.94 – 10.0.171.95	10.0.171.95
49	10.0.171.96/31	10.0.171.96 – 10.0.171.97	10.0.171.97
50	10.0.171.98/31	10.0.171.98 – 10.0.171.99	10.0.171.99
51	10.0.171.100/31	10.0.171.100 – 10.0.171.101	10.0.171.101
52	10.0.171.102/31	10.0.171.102 – 10.0.171.103	10.0.171.103
53	10.0.171.104/31	10.0.171.104 – 10.0.171.105	10.0.171.105
54	10.0.171.106/31	10.0.171.106 – 10.0.171.107	10.0.171.107
55	10.0.171.108/31	10.0.171.108 – 10.0.171.109	10.0.171.109
56	10.0.171.110/31	10.0.171.110 – 10.0.171.111	10.0.171.111
57	10.0.171.112/31	10.0.171.112 – 10.0.171.113	10.0.171.113
58	10.0.171.114/31	10.0.171.114 – 10.0.171.115	10.0.171.115
59	10.0.171.116/31	10.0.171.116 – 10.0.171.117	10.0.171.117
60	10.0.171.118/31	10.0.171.118 – 10.0.171.119	10.0.171.119
61	10.0.171.120/31	10.0.171.120 – 10.0.171.121	10.0.171.121
62	10.0.171.122/31	10.0.171.122 – 10.0.171.123	10.0.171.123
63	10.0.171.124/31	10.0.171.124 – 10.0.171.125	10.0.171.125
64	10.0.171.126/31	10.0.171.126 – 10.0.171.127	10.0.171.127
65	10.0.171.128/31	10.0.171.128 – 10.0.171.129	10.0.171.129
66	10.0.171.130/31	10.0.171.130 – 10.0.171.131	10.0.171.131
67	10.0.171.132/31	10.0.171.132 – 10.0.171.133	10.0.171.133
68	10.0.171.134/31	10.0.171.134 – 10.0.171.135	10.0.171.135
69	10.0.171.136/31	10.0.171.136 – 10.0.171.137	10.0.171.137
70	10.0.171.138/31	10.0.171.138 – 10.0.171.139	10.0.171.139
71	10.0.171.140/31	10.0.171.140 – 10.0.171.141	10.0.171.141
72	10.0.171.142/31	10.0.171.142 – 10.0.171.143	10.0.171.143
73	10.0.171.144/31	10.0.171.144 – 10.0.171.145	10.0.171.145
74	10.0.171.146/31	10.0.171.146 – 10.0.171.147	10.0.171.147
75	10.0.171.148/31	10.0.171.148 – 10.0.171.149	10.0.171.149
76	10.0.171.150/31	10.0.171.150 – 10.0.171.151	10.0.171.151
77	10.0.171.152/31	10.0.171.152 – 10.0.171.153	10.0.171.153
78	10.0.171.154/31	10.0.171.154 – 10.0.171.155	10.0.171.155
79	10.0.171.156/31	10.0.171.156 – 10.0.171.157	10.0.171.157
80	10.0.171.158/31	10.0.171.158 – 10.0.171.159	10.0.171.159
81	10.0.171.160/31	10.0.171.160 – 10.0.171.161	10.0.171.161
82	10.0.171.162/31	10.0.171.162 – 10.0.171.163	10.0.171.163
83	10.0.171.164/31	10.0.171.164 – 10.0.171.165	10.0.171.165
84	10.0.171.166/31	10.0.171.166 – 10.0.171.167	10.0.171.167
85	10.0.171.168/31	10.0.171.168 – 10.0.171.169	10.0.171.169
86	10.0.171.170/31	10.0.171.170 – 10.0.171.171	10.0.171.171
87	10.0.171.172/31	10.0.171.172 – 10.0.171.173	10.0.171.173
88	10.0.171.174/31	10.0.171.174 – 10.0.171.175	10.0.171.175
89	10.0.171.176/31	10.0.171.176 – 10.0.171.177	10.0.171.177
90	10.0.171.178/31	10.0.171.178 – 10.0.171.179	10.0.171.179
91	10.0.171.180/31	10.0.171.180 – 10.0.171.181	10.0.171.181
92	10.0.171.182/31	10.0.171.182 – 10.0.171.183	10.0.171.183
93	10.0.171.184/31	10.0.171.184 – 10.0.171.185	10.0.171.185
94	10.0.171.186/31	10.0.171.186 – 10.0.171.187	10.0.171.187
95	10.0.171.188/31	10.0.171.188 – 10.0.171.189	10.0.171.189
96	10.0.171.190/31	10.0.171.190 – 10.0.171.191	10.0.171.191
97	10.0.171.192/31	10.0.171.192 – 10.0.171.193	10.0.171.193
98	10.0.171.194/31	10.0.171.194 – 10.0.171.195	10.0.171.195
99	10.0.171.196/31	10.0.171.196 – 10.0.171.197	10.0.171.197
100	10.0.171.198/31	10.0.171.198 – 10.0.171.199	10.0.171.199
101	10.0.171.200/31	10.0.171.200 – 10.0.171.201	10.0.171.201
102	10.0.171.202/31	10.0.171.202 – 10.0.171.203	10.0.171.203
103	10.0.171.204/31	10.0.171.204 – 10.0.171.205	10.0.171.205
104	10.0.171.206/31	10.0.171.206 – 10.0.171.207	10.0.171.207
105	10.0.171.208/31	10.0.171.208 – 10.0.171.209	10.0.171.209
106	10.0.171.210/31	10.0.171.210 – 10.0.171.211	10.0.171.211
107	10.0.171.212/31	10.0.171.212 – 10.0.171.213	10.0.171.213
108	10.0.171.214/31	10.0.171.214 – 10.0.171.215	10.0.171.215
109	10.0.171.216/31	10.0.171.216 – 10.0.171.217	10.0.171.217
110	10.0.171.218/31	10.0.171.218 – 10.0.171.219	10.0.171.219
111	10.0.171.220/31	10.0.171.220 – 10.0.171.221	10.0.171.221
112	10.0.171.222/31	10.0.171.222 – 10.0.171.223	10.0.171.223
113	10.0.171.224/31	10.0.171.224 – 10.0.171.225	10.0.171.225
114	10.0.171.226/31	10.0.171.226 – 10.0.171.227	10.0.171.227
115	10.0.171.228/31	10.0.171.228 – 10.0.171.229	10.0.171.229
116	10.0.171.230/31	10.0.171.230 – 10.0.171.231	10.0.171.231
117	10.0.171.232/31	10.0.171.232 – 10.0.171.233	10.0.171.233
118	10.0.171.234/31	10.0.171.234 – 10.0.171.235	10.0.171.235
119	10.0.171.236/31	10.0.171.236 – 10.0.171.237	10.0.171.237
120	10.0.171.238/31	10.0.171.238 – 10.0.171.239	10.0.171.239
121	10.0.171.240/31	10.0.171.240 – 10.0.171.241	10.0.171.241
122	10.0.171.242/31	10.0.171.242 – 10.0.171.243	10.0.171.243
123	10.0.171.244/31	10.0.171.244 – 10.0.171.245	10.0.171.245
124	10.0.171.246/31	10.0.171.246 – 10.0.171.247	10.0.171.247
125	10.0.171.248/31	10.0.171.248 – 10.0.171.249	10.0.171.249
126	10.0.171.250/31	10.0.171.250 – 10.0.171.251	10.0.171.251
127	10.0.171.252/31	10.0.171.252 – 10.0.171.253	10.0.171.253
128	10.0.171.254/31	10.0.171.254 – 10.0.171.255	10.0.171.255

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 →