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)10.2.180.0/23

network10.2.180.0/23

broadcast10.2.181.255

first host10.2.180.1

last host10.2.181.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.180.0/23

address00001010.00000010.10110100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.10110100.00000000

broadcast00001010.00000010.10110101.11111111

green = network part, grey = host part

hex0x0a02b400

decimal167949312

reverse dns0.180.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:b400

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.180.0/30	10.2.180.1 – 10.2.180.2	10.2.180.3
2	10.2.180.4/30	10.2.180.5 – 10.2.180.6	10.2.180.7
3	10.2.180.8/30	10.2.180.9 – 10.2.180.10	10.2.180.11
4	10.2.180.12/30	10.2.180.13 – 10.2.180.14	10.2.180.15
5	10.2.180.16/30	10.2.180.17 – 10.2.180.18	10.2.180.19
6	10.2.180.20/30	10.2.180.21 – 10.2.180.22	10.2.180.23
7	10.2.180.24/30	10.2.180.25 – 10.2.180.26	10.2.180.27
8	10.2.180.28/30	10.2.180.29 – 10.2.180.30	10.2.180.31
9	10.2.180.32/30	10.2.180.33 – 10.2.180.34	10.2.180.35
10	10.2.180.36/30	10.2.180.37 – 10.2.180.38	10.2.180.39
11	10.2.180.40/30	10.2.180.41 – 10.2.180.42	10.2.180.43
12	10.2.180.44/30	10.2.180.45 – 10.2.180.46	10.2.180.47
13	10.2.180.48/30	10.2.180.49 – 10.2.180.50	10.2.180.51
14	10.2.180.52/30	10.2.180.53 – 10.2.180.54	10.2.180.55
15	10.2.180.56/30	10.2.180.57 – 10.2.180.58	10.2.180.59
16	10.2.180.60/30	10.2.180.61 – 10.2.180.62	10.2.180.63
17	10.2.180.64/30	10.2.180.65 – 10.2.180.66	10.2.180.67
18	10.2.180.68/30	10.2.180.69 – 10.2.180.70	10.2.180.71
19	10.2.180.72/30	10.2.180.73 – 10.2.180.74	10.2.180.75
20	10.2.180.76/30	10.2.180.77 – 10.2.180.78	10.2.180.79
21	10.2.180.80/30	10.2.180.81 – 10.2.180.82	10.2.180.83
22	10.2.180.84/30	10.2.180.85 – 10.2.180.86	10.2.180.87
23	10.2.180.88/30	10.2.180.89 – 10.2.180.90	10.2.180.91
24	10.2.180.92/30	10.2.180.93 – 10.2.180.94	10.2.180.95
25	10.2.180.96/30	10.2.180.97 – 10.2.180.98	10.2.180.99
26	10.2.180.100/30	10.2.180.101 – 10.2.180.102	10.2.180.103
27	10.2.180.104/30	10.2.180.105 – 10.2.180.106	10.2.180.107
28	10.2.180.108/30	10.2.180.109 – 10.2.180.110	10.2.180.111
29	10.2.180.112/30	10.2.180.113 – 10.2.180.114	10.2.180.115
30	10.2.180.116/30	10.2.180.117 – 10.2.180.118	10.2.180.119
31	10.2.180.120/30	10.2.180.121 – 10.2.180.122	10.2.180.123
32	10.2.180.124/30	10.2.180.125 – 10.2.180.126	10.2.180.127
33	10.2.180.128/30	10.2.180.129 – 10.2.180.130	10.2.180.131
34	10.2.180.132/30	10.2.180.133 – 10.2.180.134	10.2.180.135
35	10.2.180.136/30	10.2.180.137 – 10.2.180.138	10.2.180.139
36	10.2.180.140/30	10.2.180.141 – 10.2.180.142	10.2.180.143
37	10.2.180.144/30	10.2.180.145 – 10.2.180.146	10.2.180.147
38	10.2.180.148/30	10.2.180.149 – 10.2.180.150	10.2.180.151
39	10.2.180.152/30	10.2.180.153 – 10.2.180.154	10.2.180.155
40	10.2.180.156/30	10.2.180.157 – 10.2.180.158	10.2.180.159
41	10.2.180.160/30	10.2.180.161 – 10.2.180.162	10.2.180.163
42	10.2.180.164/30	10.2.180.165 – 10.2.180.166	10.2.180.167
43	10.2.180.168/30	10.2.180.169 – 10.2.180.170	10.2.180.171
44	10.2.180.172/30	10.2.180.173 – 10.2.180.174	10.2.180.175
45	10.2.180.176/30	10.2.180.177 – 10.2.180.178	10.2.180.179
46	10.2.180.180/30	10.2.180.181 – 10.2.180.182	10.2.180.183
47	10.2.180.184/30	10.2.180.185 – 10.2.180.186	10.2.180.187
48	10.2.180.188/30	10.2.180.189 – 10.2.180.190	10.2.180.191
49	10.2.180.192/30	10.2.180.193 – 10.2.180.194	10.2.180.195
50	10.2.180.196/30	10.2.180.197 – 10.2.180.198	10.2.180.199
51	10.2.180.200/30	10.2.180.201 – 10.2.180.202	10.2.180.203
52	10.2.180.204/30	10.2.180.205 – 10.2.180.206	10.2.180.207
53	10.2.180.208/30	10.2.180.209 – 10.2.180.210	10.2.180.211
54	10.2.180.212/30	10.2.180.213 – 10.2.180.214	10.2.180.215
55	10.2.180.216/30	10.2.180.217 – 10.2.180.218	10.2.180.219
56	10.2.180.220/30	10.2.180.221 – 10.2.180.222	10.2.180.223
57	10.2.180.224/30	10.2.180.225 – 10.2.180.226	10.2.180.227
58	10.2.180.228/30	10.2.180.229 – 10.2.180.230	10.2.180.231
59	10.2.180.232/30	10.2.180.233 – 10.2.180.234	10.2.180.235
60	10.2.180.236/30	10.2.180.237 – 10.2.180.238	10.2.180.239
61	10.2.180.240/30	10.2.180.241 – 10.2.180.242	10.2.180.243
62	10.2.180.244/30	10.2.180.245 – 10.2.180.246	10.2.180.247
63	10.2.180.248/30	10.2.180.249 – 10.2.180.250	10.2.180.251
64	10.2.180.252/30	10.2.180.253 – 10.2.180.254	10.2.180.255
65	10.2.181.0/30	10.2.181.1 – 10.2.181.2	10.2.181.3
66	10.2.181.4/30	10.2.181.5 – 10.2.181.6	10.2.181.7
67	10.2.181.8/30	10.2.181.9 – 10.2.181.10	10.2.181.11
68	10.2.181.12/30	10.2.181.13 – 10.2.181.14	10.2.181.15
69	10.2.181.16/30	10.2.181.17 – 10.2.181.18	10.2.181.19
70	10.2.181.20/30	10.2.181.21 – 10.2.181.22	10.2.181.23
71	10.2.181.24/30	10.2.181.25 – 10.2.181.26	10.2.181.27
72	10.2.181.28/30	10.2.181.29 – 10.2.181.30	10.2.181.31
73	10.2.181.32/30	10.2.181.33 – 10.2.181.34	10.2.181.35
74	10.2.181.36/30	10.2.181.37 – 10.2.181.38	10.2.181.39
75	10.2.181.40/30	10.2.181.41 – 10.2.181.42	10.2.181.43
76	10.2.181.44/30	10.2.181.45 – 10.2.181.46	10.2.181.47
77	10.2.181.48/30	10.2.181.49 – 10.2.181.50	10.2.181.51
78	10.2.181.52/30	10.2.181.53 – 10.2.181.54	10.2.181.55
79	10.2.181.56/30	10.2.181.57 – 10.2.181.58	10.2.181.59
80	10.2.181.60/30	10.2.181.61 – 10.2.181.62	10.2.181.63
81	10.2.181.64/30	10.2.181.65 – 10.2.181.66	10.2.181.67
82	10.2.181.68/30	10.2.181.69 – 10.2.181.70	10.2.181.71
83	10.2.181.72/30	10.2.181.73 – 10.2.181.74	10.2.181.75
84	10.2.181.76/30	10.2.181.77 – 10.2.181.78	10.2.181.79
85	10.2.181.80/30	10.2.181.81 – 10.2.181.82	10.2.181.83
86	10.2.181.84/30	10.2.181.85 – 10.2.181.86	10.2.181.87
87	10.2.181.88/30	10.2.181.89 – 10.2.181.90	10.2.181.91
88	10.2.181.92/30	10.2.181.93 – 10.2.181.94	10.2.181.95
89	10.2.181.96/30	10.2.181.97 – 10.2.181.98	10.2.181.99
90	10.2.181.100/30	10.2.181.101 – 10.2.181.102	10.2.181.103
91	10.2.181.104/30	10.2.181.105 – 10.2.181.106	10.2.181.107
92	10.2.181.108/30	10.2.181.109 – 10.2.181.110	10.2.181.111
93	10.2.181.112/30	10.2.181.113 – 10.2.181.114	10.2.181.115
94	10.2.181.116/30	10.2.181.117 – 10.2.181.118	10.2.181.119
95	10.2.181.120/30	10.2.181.121 – 10.2.181.122	10.2.181.123
96	10.2.181.124/30	10.2.181.125 – 10.2.181.126	10.2.181.127
97	10.2.181.128/30	10.2.181.129 – 10.2.181.130	10.2.181.131
98	10.2.181.132/30	10.2.181.133 – 10.2.181.134	10.2.181.135
99	10.2.181.136/30	10.2.181.137 – 10.2.181.138	10.2.181.139
100	10.2.181.140/30	10.2.181.141 – 10.2.181.142	10.2.181.143
101	10.2.181.144/30	10.2.181.145 – 10.2.181.146	10.2.181.147
102	10.2.181.148/30	10.2.181.149 – 10.2.181.150	10.2.181.151
103	10.2.181.152/30	10.2.181.153 – 10.2.181.154	10.2.181.155
104	10.2.181.156/30	10.2.181.157 – 10.2.181.158	10.2.181.159
105	10.2.181.160/30	10.2.181.161 – 10.2.181.162	10.2.181.163
106	10.2.181.164/30	10.2.181.165 – 10.2.181.166	10.2.181.167
107	10.2.181.168/30	10.2.181.169 – 10.2.181.170	10.2.181.171
108	10.2.181.172/30	10.2.181.173 – 10.2.181.174	10.2.181.175
109	10.2.181.176/30	10.2.181.177 – 10.2.181.178	10.2.181.179
110	10.2.181.180/30	10.2.181.181 – 10.2.181.182	10.2.181.183
111	10.2.181.184/30	10.2.181.185 – 10.2.181.186	10.2.181.187
112	10.2.181.188/30	10.2.181.189 – 10.2.181.190	10.2.181.191
113	10.2.181.192/30	10.2.181.193 – 10.2.181.194	10.2.181.195
114	10.2.181.196/30	10.2.181.197 – 10.2.181.198	10.2.181.199
115	10.2.181.200/30	10.2.181.201 – 10.2.181.202	10.2.181.203
116	10.2.181.204/30	10.2.181.205 – 10.2.181.206	10.2.181.207
117	10.2.181.208/30	10.2.181.209 – 10.2.181.210	10.2.181.211
118	10.2.181.212/30	10.2.181.213 – 10.2.181.214	10.2.181.215
119	10.2.181.216/30	10.2.181.217 – 10.2.181.218	10.2.181.219
120	10.2.181.220/30	10.2.181.221 – 10.2.181.222	10.2.181.223
121	10.2.181.224/30	10.2.181.225 – 10.2.181.226	10.2.181.227
122	10.2.181.228/30	10.2.181.229 – 10.2.181.230	10.2.181.231
123	10.2.181.232/30	10.2.181.233 – 10.2.181.234	10.2.181.235
124	10.2.181.236/30	10.2.181.237 – 10.2.181.238	10.2.181.239
125	10.2.181.240/30	10.2.181.241 – 10.2.181.242	10.2.181.243
126	10.2.181.244/30	10.2.181.245 – 10.2.181.246	10.2.181.247
127	10.2.181.248/30	10.2.181.249 – 10.2.181.250	10.2.181.251
128	10.2.181.252/30	10.2.181.253 – 10.2.181.254	10.2.181.255

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 →