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)10.2.173.0/24

network10.2.173.0/24

broadcast10.2.173.255

first host10.2.173.1

last host10.2.173.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.173.0/24

address00001010.00000010.10101101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10101101.00000000

broadcast00001010.00000010.10101101.11111111

green = network part, grey = host part

hex0x0a02ad00

decimal167947520

reverse dns0.173.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:ad00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.173.0/31	10.2.173.0 – 10.2.173.1	10.2.173.1
2	10.2.173.2/31	10.2.173.2 – 10.2.173.3	10.2.173.3
3	10.2.173.4/31	10.2.173.4 – 10.2.173.5	10.2.173.5
4	10.2.173.6/31	10.2.173.6 – 10.2.173.7	10.2.173.7
5	10.2.173.8/31	10.2.173.8 – 10.2.173.9	10.2.173.9
6	10.2.173.10/31	10.2.173.10 – 10.2.173.11	10.2.173.11
7	10.2.173.12/31	10.2.173.12 – 10.2.173.13	10.2.173.13
8	10.2.173.14/31	10.2.173.14 – 10.2.173.15	10.2.173.15
9	10.2.173.16/31	10.2.173.16 – 10.2.173.17	10.2.173.17
10	10.2.173.18/31	10.2.173.18 – 10.2.173.19	10.2.173.19
11	10.2.173.20/31	10.2.173.20 – 10.2.173.21	10.2.173.21
12	10.2.173.22/31	10.2.173.22 – 10.2.173.23	10.2.173.23
13	10.2.173.24/31	10.2.173.24 – 10.2.173.25	10.2.173.25
14	10.2.173.26/31	10.2.173.26 – 10.2.173.27	10.2.173.27
15	10.2.173.28/31	10.2.173.28 – 10.2.173.29	10.2.173.29
16	10.2.173.30/31	10.2.173.30 – 10.2.173.31	10.2.173.31
17	10.2.173.32/31	10.2.173.32 – 10.2.173.33	10.2.173.33
18	10.2.173.34/31	10.2.173.34 – 10.2.173.35	10.2.173.35
19	10.2.173.36/31	10.2.173.36 – 10.2.173.37	10.2.173.37
20	10.2.173.38/31	10.2.173.38 – 10.2.173.39	10.2.173.39
21	10.2.173.40/31	10.2.173.40 – 10.2.173.41	10.2.173.41
22	10.2.173.42/31	10.2.173.42 – 10.2.173.43	10.2.173.43
23	10.2.173.44/31	10.2.173.44 – 10.2.173.45	10.2.173.45
24	10.2.173.46/31	10.2.173.46 – 10.2.173.47	10.2.173.47
25	10.2.173.48/31	10.2.173.48 – 10.2.173.49	10.2.173.49
26	10.2.173.50/31	10.2.173.50 – 10.2.173.51	10.2.173.51
27	10.2.173.52/31	10.2.173.52 – 10.2.173.53	10.2.173.53
28	10.2.173.54/31	10.2.173.54 – 10.2.173.55	10.2.173.55
29	10.2.173.56/31	10.2.173.56 – 10.2.173.57	10.2.173.57
30	10.2.173.58/31	10.2.173.58 – 10.2.173.59	10.2.173.59
31	10.2.173.60/31	10.2.173.60 – 10.2.173.61	10.2.173.61
32	10.2.173.62/31	10.2.173.62 – 10.2.173.63	10.2.173.63
33	10.2.173.64/31	10.2.173.64 – 10.2.173.65	10.2.173.65
34	10.2.173.66/31	10.2.173.66 – 10.2.173.67	10.2.173.67
35	10.2.173.68/31	10.2.173.68 – 10.2.173.69	10.2.173.69
36	10.2.173.70/31	10.2.173.70 – 10.2.173.71	10.2.173.71
37	10.2.173.72/31	10.2.173.72 – 10.2.173.73	10.2.173.73
38	10.2.173.74/31	10.2.173.74 – 10.2.173.75	10.2.173.75
39	10.2.173.76/31	10.2.173.76 – 10.2.173.77	10.2.173.77
40	10.2.173.78/31	10.2.173.78 – 10.2.173.79	10.2.173.79
41	10.2.173.80/31	10.2.173.80 – 10.2.173.81	10.2.173.81
42	10.2.173.82/31	10.2.173.82 – 10.2.173.83	10.2.173.83
43	10.2.173.84/31	10.2.173.84 – 10.2.173.85	10.2.173.85
44	10.2.173.86/31	10.2.173.86 – 10.2.173.87	10.2.173.87
45	10.2.173.88/31	10.2.173.88 – 10.2.173.89	10.2.173.89
46	10.2.173.90/31	10.2.173.90 – 10.2.173.91	10.2.173.91
47	10.2.173.92/31	10.2.173.92 – 10.2.173.93	10.2.173.93
48	10.2.173.94/31	10.2.173.94 – 10.2.173.95	10.2.173.95
49	10.2.173.96/31	10.2.173.96 – 10.2.173.97	10.2.173.97
50	10.2.173.98/31	10.2.173.98 – 10.2.173.99	10.2.173.99
51	10.2.173.100/31	10.2.173.100 – 10.2.173.101	10.2.173.101
52	10.2.173.102/31	10.2.173.102 – 10.2.173.103	10.2.173.103
53	10.2.173.104/31	10.2.173.104 – 10.2.173.105	10.2.173.105
54	10.2.173.106/31	10.2.173.106 – 10.2.173.107	10.2.173.107
55	10.2.173.108/31	10.2.173.108 – 10.2.173.109	10.2.173.109
56	10.2.173.110/31	10.2.173.110 – 10.2.173.111	10.2.173.111
57	10.2.173.112/31	10.2.173.112 – 10.2.173.113	10.2.173.113
58	10.2.173.114/31	10.2.173.114 – 10.2.173.115	10.2.173.115
59	10.2.173.116/31	10.2.173.116 – 10.2.173.117	10.2.173.117
60	10.2.173.118/31	10.2.173.118 – 10.2.173.119	10.2.173.119
61	10.2.173.120/31	10.2.173.120 – 10.2.173.121	10.2.173.121
62	10.2.173.122/31	10.2.173.122 – 10.2.173.123	10.2.173.123
63	10.2.173.124/31	10.2.173.124 – 10.2.173.125	10.2.173.125
64	10.2.173.126/31	10.2.173.126 – 10.2.173.127	10.2.173.127
65	10.2.173.128/31	10.2.173.128 – 10.2.173.129	10.2.173.129
66	10.2.173.130/31	10.2.173.130 – 10.2.173.131	10.2.173.131
67	10.2.173.132/31	10.2.173.132 – 10.2.173.133	10.2.173.133
68	10.2.173.134/31	10.2.173.134 – 10.2.173.135	10.2.173.135
69	10.2.173.136/31	10.2.173.136 – 10.2.173.137	10.2.173.137
70	10.2.173.138/31	10.2.173.138 – 10.2.173.139	10.2.173.139
71	10.2.173.140/31	10.2.173.140 – 10.2.173.141	10.2.173.141
72	10.2.173.142/31	10.2.173.142 – 10.2.173.143	10.2.173.143
73	10.2.173.144/31	10.2.173.144 – 10.2.173.145	10.2.173.145
74	10.2.173.146/31	10.2.173.146 – 10.2.173.147	10.2.173.147
75	10.2.173.148/31	10.2.173.148 – 10.2.173.149	10.2.173.149
76	10.2.173.150/31	10.2.173.150 – 10.2.173.151	10.2.173.151
77	10.2.173.152/31	10.2.173.152 – 10.2.173.153	10.2.173.153
78	10.2.173.154/31	10.2.173.154 – 10.2.173.155	10.2.173.155
79	10.2.173.156/31	10.2.173.156 – 10.2.173.157	10.2.173.157
80	10.2.173.158/31	10.2.173.158 – 10.2.173.159	10.2.173.159
81	10.2.173.160/31	10.2.173.160 – 10.2.173.161	10.2.173.161
82	10.2.173.162/31	10.2.173.162 – 10.2.173.163	10.2.173.163
83	10.2.173.164/31	10.2.173.164 – 10.2.173.165	10.2.173.165
84	10.2.173.166/31	10.2.173.166 – 10.2.173.167	10.2.173.167
85	10.2.173.168/31	10.2.173.168 – 10.2.173.169	10.2.173.169
86	10.2.173.170/31	10.2.173.170 – 10.2.173.171	10.2.173.171
87	10.2.173.172/31	10.2.173.172 – 10.2.173.173	10.2.173.173
88	10.2.173.174/31	10.2.173.174 – 10.2.173.175	10.2.173.175
89	10.2.173.176/31	10.2.173.176 – 10.2.173.177	10.2.173.177
90	10.2.173.178/31	10.2.173.178 – 10.2.173.179	10.2.173.179
91	10.2.173.180/31	10.2.173.180 – 10.2.173.181	10.2.173.181
92	10.2.173.182/31	10.2.173.182 – 10.2.173.183	10.2.173.183
93	10.2.173.184/31	10.2.173.184 – 10.2.173.185	10.2.173.185
94	10.2.173.186/31	10.2.173.186 – 10.2.173.187	10.2.173.187
95	10.2.173.188/31	10.2.173.188 – 10.2.173.189	10.2.173.189
96	10.2.173.190/31	10.2.173.190 – 10.2.173.191	10.2.173.191
97	10.2.173.192/31	10.2.173.192 – 10.2.173.193	10.2.173.193
98	10.2.173.194/31	10.2.173.194 – 10.2.173.195	10.2.173.195
99	10.2.173.196/31	10.2.173.196 – 10.2.173.197	10.2.173.197
100	10.2.173.198/31	10.2.173.198 – 10.2.173.199	10.2.173.199
101	10.2.173.200/31	10.2.173.200 – 10.2.173.201	10.2.173.201
102	10.2.173.202/31	10.2.173.202 – 10.2.173.203	10.2.173.203
103	10.2.173.204/31	10.2.173.204 – 10.2.173.205	10.2.173.205
104	10.2.173.206/31	10.2.173.206 – 10.2.173.207	10.2.173.207
105	10.2.173.208/31	10.2.173.208 – 10.2.173.209	10.2.173.209
106	10.2.173.210/31	10.2.173.210 – 10.2.173.211	10.2.173.211
107	10.2.173.212/31	10.2.173.212 – 10.2.173.213	10.2.173.213
108	10.2.173.214/31	10.2.173.214 – 10.2.173.215	10.2.173.215
109	10.2.173.216/31	10.2.173.216 – 10.2.173.217	10.2.173.217
110	10.2.173.218/31	10.2.173.218 – 10.2.173.219	10.2.173.219
111	10.2.173.220/31	10.2.173.220 – 10.2.173.221	10.2.173.221
112	10.2.173.222/31	10.2.173.222 – 10.2.173.223	10.2.173.223
113	10.2.173.224/31	10.2.173.224 – 10.2.173.225	10.2.173.225
114	10.2.173.226/31	10.2.173.226 – 10.2.173.227	10.2.173.227
115	10.2.173.228/31	10.2.173.228 – 10.2.173.229	10.2.173.229
116	10.2.173.230/31	10.2.173.230 – 10.2.173.231	10.2.173.231
117	10.2.173.232/31	10.2.173.232 – 10.2.173.233	10.2.173.233
118	10.2.173.234/31	10.2.173.234 – 10.2.173.235	10.2.173.235
119	10.2.173.236/31	10.2.173.236 – 10.2.173.237	10.2.173.237
120	10.2.173.238/31	10.2.173.238 – 10.2.173.239	10.2.173.239
121	10.2.173.240/31	10.2.173.240 – 10.2.173.241	10.2.173.241
122	10.2.173.242/31	10.2.173.242 – 10.2.173.243	10.2.173.243
123	10.2.173.244/31	10.2.173.244 – 10.2.173.245	10.2.173.245
124	10.2.173.246/31	10.2.173.246 – 10.2.173.247	10.2.173.247
125	10.2.173.248/31	10.2.173.248 – 10.2.173.249	10.2.173.249
126	10.2.173.250/31	10.2.173.250 – 10.2.173.251	10.2.173.251
127	10.2.173.252/31	10.2.173.252 – 10.2.173.253	10.2.173.253
128	10.2.173.254/31	10.2.173.254 – 10.2.173.255	10.2.173.255

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 →