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)10.2.172.0/23

network10.2.172.0/23

broadcast10.2.173.255

first host10.2.172.1

last host10.2.173.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.172.0/23

address00001010.00000010.10101100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.10101100.00000000

broadcast00001010.00000010.10101101.11111111

green = network part, grey = host part

hex0x0a02ac00

decimal167947264

reverse dns0.172.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:ac00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.172.0/30	10.2.172.1 – 10.2.172.2	10.2.172.3
2	10.2.172.4/30	10.2.172.5 – 10.2.172.6	10.2.172.7
3	10.2.172.8/30	10.2.172.9 – 10.2.172.10	10.2.172.11
4	10.2.172.12/30	10.2.172.13 – 10.2.172.14	10.2.172.15
5	10.2.172.16/30	10.2.172.17 – 10.2.172.18	10.2.172.19
6	10.2.172.20/30	10.2.172.21 – 10.2.172.22	10.2.172.23
7	10.2.172.24/30	10.2.172.25 – 10.2.172.26	10.2.172.27
8	10.2.172.28/30	10.2.172.29 – 10.2.172.30	10.2.172.31
9	10.2.172.32/30	10.2.172.33 – 10.2.172.34	10.2.172.35
10	10.2.172.36/30	10.2.172.37 – 10.2.172.38	10.2.172.39
11	10.2.172.40/30	10.2.172.41 – 10.2.172.42	10.2.172.43
12	10.2.172.44/30	10.2.172.45 – 10.2.172.46	10.2.172.47
13	10.2.172.48/30	10.2.172.49 – 10.2.172.50	10.2.172.51
14	10.2.172.52/30	10.2.172.53 – 10.2.172.54	10.2.172.55
15	10.2.172.56/30	10.2.172.57 – 10.2.172.58	10.2.172.59
16	10.2.172.60/30	10.2.172.61 – 10.2.172.62	10.2.172.63
17	10.2.172.64/30	10.2.172.65 – 10.2.172.66	10.2.172.67
18	10.2.172.68/30	10.2.172.69 – 10.2.172.70	10.2.172.71
19	10.2.172.72/30	10.2.172.73 – 10.2.172.74	10.2.172.75
20	10.2.172.76/30	10.2.172.77 – 10.2.172.78	10.2.172.79
21	10.2.172.80/30	10.2.172.81 – 10.2.172.82	10.2.172.83
22	10.2.172.84/30	10.2.172.85 – 10.2.172.86	10.2.172.87
23	10.2.172.88/30	10.2.172.89 – 10.2.172.90	10.2.172.91
24	10.2.172.92/30	10.2.172.93 – 10.2.172.94	10.2.172.95
25	10.2.172.96/30	10.2.172.97 – 10.2.172.98	10.2.172.99
26	10.2.172.100/30	10.2.172.101 – 10.2.172.102	10.2.172.103
27	10.2.172.104/30	10.2.172.105 – 10.2.172.106	10.2.172.107
28	10.2.172.108/30	10.2.172.109 – 10.2.172.110	10.2.172.111
29	10.2.172.112/30	10.2.172.113 – 10.2.172.114	10.2.172.115
30	10.2.172.116/30	10.2.172.117 – 10.2.172.118	10.2.172.119
31	10.2.172.120/30	10.2.172.121 – 10.2.172.122	10.2.172.123
32	10.2.172.124/30	10.2.172.125 – 10.2.172.126	10.2.172.127
33	10.2.172.128/30	10.2.172.129 – 10.2.172.130	10.2.172.131
34	10.2.172.132/30	10.2.172.133 – 10.2.172.134	10.2.172.135
35	10.2.172.136/30	10.2.172.137 – 10.2.172.138	10.2.172.139
36	10.2.172.140/30	10.2.172.141 – 10.2.172.142	10.2.172.143
37	10.2.172.144/30	10.2.172.145 – 10.2.172.146	10.2.172.147
38	10.2.172.148/30	10.2.172.149 – 10.2.172.150	10.2.172.151
39	10.2.172.152/30	10.2.172.153 – 10.2.172.154	10.2.172.155
40	10.2.172.156/30	10.2.172.157 – 10.2.172.158	10.2.172.159
41	10.2.172.160/30	10.2.172.161 – 10.2.172.162	10.2.172.163
42	10.2.172.164/30	10.2.172.165 – 10.2.172.166	10.2.172.167
43	10.2.172.168/30	10.2.172.169 – 10.2.172.170	10.2.172.171
44	10.2.172.172/30	10.2.172.173 – 10.2.172.174	10.2.172.175
45	10.2.172.176/30	10.2.172.177 – 10.2.172.178	10.2.172.179
46	10.2.172.180/30	10.2.172.181 – 10.2.172.182	10.2.172.183
47	10.2.172.184/30	10.2.172.185 – 10.2.172.186	10.2.172.187
48	10.2.172.188/30	10.2.172.189 – 10.2.172.190	10.2.172.191
49	10.2.172.192/30	10.2.172.193 – 10.2.172.194	10.2.172.195
50	10.2.172.196/30	10.2.172.197 – 10.2.172.198	10.2.172.199
51	10.2.172.200/30	10.2.172.201 – 10.2.172.202	10.2.172.203
52	10.2.172.204/30	10.2.172.205 – 10.2.172.206	10.2.172.207
53	10.2.172.208/30	10.2.172.209 – 10.2.172.210	10.2.172.211
54	10.2.172.212/30	10.2.172.213 – 10.2.172.214	10.2.172.215
55	10.2.172.216/30	10.2.172.217 – 10.2.172.218	10.2.172.219
56	10.2.172.220/30	10.2.172.221 – 10.2.172.222	10.2.172.223
57	10.2.172.224/30	10.2.172.225 – 10.2.172.226	10.2.172.227
58	10.2.172.228/30	10.2.172.229 – 10.2.172.230	10.2.172.231
59	10.2.172.232/30	10.2.172.233 – 10.2.172.234	10.2.172.235
60	10.2.172.236/30	10.2.172.237 – 10.2.172.238	10.2.172.239
61	10.2.172.240/30	10.2.172.241 – 10.2.172.242	10.2.172.243
62	10.2.172.244/30	10.2.172.245 – 10.2.172.246	10.2.172.247
63	10.2.172.248/30	10.2.172.249 – 10.2.172.250	10.2.172.251
64	10.2.172.252/30	10.2.172.253 – 10.2.172.254	10.2.172.255
65	10.2.173.0/30	10.2.173.1 – 10.2.173.2	10.2.173.3
66	10.2.173.4/30	10.2.173.5 – 10.2.173.6	10.2.173.7
67	10.2.173.8/30	10.2.173.9 – 10.2.173.10	10.2.173.11
68	10.2.173.12/30	10.2.173.13 – 10.2.173.14	10.2.173.15
69	10.2.173.16/30	10.2.173.17 – 10.2.173.18	10.2.173.19
70	10.2.173.20/30	10.2.173.21 – 10.2.173.22	10.2.173.23
71	10.2.173.24/30	10.2.173.25 – 10.2.173.26	10.2.173.27
72	10.2.173.28/30	10.2.173.29 – 10.2.173.30	10.2.173.31
73	10.2.173.32/30	10.2.173.33 – 10.2.173.34	10.2.173.35
74	10.2.173.36/30	10.2.173.37 – 10.2.173.38	10.2.173.39
75	10.2.173.40/30	10.2.173.41 – 10.2.173.42	10.2.173.43
76	10.2.173.44/30	10.2.173.45 – 10.2.173.46	10.2.173.47
77	10.2.173.48/30	10.2.173.49 – 10.2.173.50	10.2.173.51
78	10.2.173.52/30	10.2.173.53 – 10.2.173.54	10.2.173.55
79	10.2.173.56/30	10.2.173.57 – 10.2.173.58	10.2.173.59
80	10.2.173.60/30	10.2.173.61 – 10.2.173.62	10.2.173.63
81	10.2.173.64/30	10.2.173.65 – 10.2.173.66	10.2.173.67
82	10.2.173.68/30	10.2.173.69 – 10.2.173.70	10.2.173.71
83	10.2.173.72/30	10.2.173.73 – 10.2.173.74	10.2.173.75
84	10.2.173.76/30	10.2.173.77 – 10.2.173.78	10.2.173.79
85	10.2.173.80/30	10.2.173.81 – 10.2.173.82	10.2.173.83
86	10.2.173.84/30	10.2.173.85 – 10.2.173.86	10.2.173.87
87	10.2.173.88/30	10.2.173.89 – 10.2.173.90	10.2.173.91
88	10.2.173.92/30	10.2.173.93 – 10.2.173.94	10.2.173.95
89	10.2.173.96/30	10.2.173.97 – 10.2.173.98	10.2.173.99
90	10.2.173.100/30	10.2.173.101 – 10.2.173.102	10.2.173.103
91	10.2.173.104/30	10.2.173.105 – 10.2.173.106	10.2.173.107
92	10.2.173.108/30	10.2.173.109 – 10.2.173.110	10.2.173.111
93	10.2.173.112/30	10.2.173.113 – 10.2.173.114	10.2.173.115
94	10.2.173.116/30	10.2.173.117 – 10.2.173.118	10.2.173.119
95	10.2.173.120/30	10.2.173.121 – 10.2.173.122	10.2.173.123
96	10.2.173.124/30	10.2.173.125 – 10.2.173.126	10.2.173.127
97	10.2.173.128/30	10.2.173.129 – 10.2.173.130	10.2.173.131
98	10.2.173.132/30	10.2.173.133 – 10.2.173.134	10.2.173.135
99	10.2.173.136/30	10.2.173.137 – 10.2.173.138	10.2.173.139
100	10.2.173.140/30	10.2.173.141 – 10.2.173.142	10.2.173.143
101	10.2.173.144/30	10.2.173.145 – 10.2.173.146	10.2.173.147
102	10.2.173.148/30	10.2.173.149 – 10.2.173.150	10.2.173.151
103	10.2.173.152/30	10.2.173.153 – 10.2.173.154	10.2.173.155
104	10.2.173.156/30	10.2.173.157 – 10.2.173.158	10.2.173.159
105	10.2.173.160/30	10.2.173.161 – 10.2.173.162	10.2.173.163
106	10.2.173.164/30	10.2.173.165 – 10.2.173.166	10.2.173.167
107	10.2.173.168/30	10.2.173.169 – 10.2.173.170	10.2.173.171
108	10.2.173.172/30	10.2.173.173 – 10.2.173.174	10.2.173.175
109	10.2.173.176/30	10.2.173.177 – 10.2.173.178	10.2.173.179
110	10.2.173.180/30	10.2.173.181 – 10.2.173.182	10.2.173.183
111	10.2.173.184/30	10.2.173.185 – 10.2.173.186	10.2.173.187
112	10.2.173.188/30	10.2.173.189 – 10.2.173.190	10.2.173.191
113	10.2.173.192/30	10.2.173.193 – 10.2.173.194	10.2.173.195
114	10.2.173.196/30	10.2.173.197 – 10.2.173.198	10.2.173.199
115	10.2.173.200/30	10.2.173.201 – 10.2.173.202	10.2.173.203
116	10.2.173.204/30	10.2.173.205 – 10.2.173.206	10.2.173.207
117	10.2.173.208/30	10.2.173.209 – 10.2.173.210	10.2.173.211
118	10.2.173.212/30	10.2.173.213 – 10.2.173.214	10.2.173.215
119	10.2.173.216/30	10.2.173.217 – 10.2.173.218	10.2.173.219
120	10.2.173.220/30	10.2.173.221 – 10.2.173.222	10.2.173.223
121	10.2.173.224/30	10.2.173.225 – 10.2.173.226	10.2.173.227
122	10.2.173.228/30	10.2.173.229 – 10.2.173.230	10.2.173.231
123	10.2.173.232/30	10.2.173.233 – 10.2.173.234	10.2.173.235
124	10.2.173.236/30	10.2.173.237 – 10.2.173.238	10.2.173.239
125	10.2.173.240/30	10.2.173.241 – 10.2.173.242	10.2.173.243
126	10.2.173.244/30	10.2.173.245 – 10.2.173.246	10.2.173.247
127	10.2.173.248/30	10.2.173.249 – 10.2.173.250	10.2.173.251
128	10.2.173.252/30	10.2.173.253 – 10.2.173.254	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 /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 →