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)10.2.80.0/23

network10.2.80.0/23

broadcast10.2.81.255

first host10.2.80.1

last host10.2.81.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.80.0/23

address00001010.00000010.01010000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.01010000.00000000

broadcast00001010.00000010.01010001.11111111

green = network part, grey = host part

hex0x0a025000

decimal167923712

reverse dns0.80.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:5000

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.80.0/30	10.2.80.1 – 10.2.80.2	10.2.80.3
2	10.2.80.4/30	10.2.80.5 – 10.2.80.6	10.2.80.7
3	10.2.80.8/30	10.2.80.9 – 10.2.80.10	10.2.80.11
4	10.2.80.12/30	10.2.80.13 – 10.2.80.14	10.2.80.15
5	10.2.80.16/30	10.2.80.17 – 10.2.80.18	10.2.80.19
6	10.2.80.20/30	10.2.80.21 – 10.2.80.22	10.2.80.23
7	10.2.80.24/30	10.2.80.25 – 10.2.80.26	10.2.80.27
8	10.2.80.28/30	10.2.80.29 – 10.2.80.30	10.2.80.31
9	10.2.80.32/30	10.2.80.33 – 10.2.80.34	10.2.80.35
10	10.2.80.36/30	10.2.80.37 – 10.2.80.38	10.2.80.39
11	10.2.80.40/30	10.2.80.41 – 10.2.80.42	10.2.80.43
12	10.2.80.44/30	10.2.80.45 – 10.2.80.46	10.2.80.47
13	10.2.80.48/30	10.2.80.49 – 10.2.80.50	10.2.80.51
14	10.2.80.52/30	10.2.80.53 – 10.2.80.54	10.2.80.55
15	10.2.80.56/30	10.2.80.57 – 10.2.80.58	10.2.80.59
16	10.2.80.60/30	10.2.80.61 – 10.2.80.62	10.2.80.63
17	10.2.80.64/30	10.2.80.65 – 10.2.80.66	10.2.80.67
18	10.2.80.68/30	10.2.80.69 – 10.2.80.70	10.2.80.71
19	10.2.80.72/30	10.2.80.73 – 10.2.80.74	10.2.80.75
20	10.2.80.76/30	10.2.80.77 – 10.2.80.78	10.2.80.79
21	10.2.80.80/30	10.2.80.81 – 10.2.80.82	10.2.80.83
22	10.2.80.84/30	10.2.80.85 – 10.2.80.86	10.2.80.87
23	10.2.80.88/30	10.2.80.89 – 10.2.80.90	10.2.80.91
24	10.2.80.92/30	10.2.80.93 – 10.2.80.94	10.2.80.95
25	10.2.80.96/30	10.2.80.97 – 10.2.80.98	10.2.80.99
26	10.2.80.100/30	10.2.80.101 – 10.2.80.102	10.2.80.103
27	10.2.80.104/30	10.2.80.105 – 10.2.80.106	10.2.80.107
28	10.2.80.108/30	10.2.80.109 – 10.2.80.110	10.2.80.111
29	10.2.80.112/30	10.2.80.113 – 10.2.80.114	10.2.80.115
30	10.2.80.116/30	10.2.80.117 – 10.2.80.118	10.2.80.119
31	10.2.80.120/30	10.2.80.121 – 10.2.80.122	10.2.80.123
32	10.2.80.124/30	10.2.80.125 – 10.2.80.126	10.2.80.127
33	10.2.80.128/30	10.2.80.129 – 10.2.80.130	10.2.80.131
34	10.2.80.132/30	10.2.80.133 – 10.2.80.134	10.2.80.135
35	10.2.80.136/30	10.2.80.137 – 10.2.80.138	10.2.80.139
36	10.2.80.140/30	10.2.80.141 – 10.2.80.142	10.2.80.143
37	10.2.80.144/30	10.2.80.145 – 10.2.80.146	10.2.80.147
38	10.2.80.148/30	10.2.80.149 – 10.2.80.150	10.2.80.151
39	10.2.80.152/30	10.2.80.153 – 10.2.80.154	10.2.80.155
40	10.2.80.156/30	10.2.80.157 – 10.2.80.158	10.2.80.159
41	10.2.80.160/30	10.2.80.161 – 10.2.80.162	10.2.80.163
42	10.2.80.164/30	10.2.80.165 – 10.2.80.166	10.2.80.167
43	10.2.80.168/30	10.2.80.169 – 10.2.80.170	10.2.80.171
44	10.2.80.172/30	10.2.80.173 – 10.2.80.174	10.2.80.175
45	10.2.80.176/30	10.2.80.177 – 10.2.80.178	10.2.80.179
46	10.2.80.180/30	10.2.80.181 – 10.2.80.182	10.2.80.183
47	10.2.80.184/30	10.2.80.185 – 10.2.80.186	10.2.80.187
48	10.2.80.188/30	10.2.80.189 – 10.2.80.190	10.2.80.191
49	10.2.80.192/30	10.2.80.193 – 10.2.80.194	10.2.80.195
50	10.2.80.196/30	10.2.80.197 – 10.2.80.198	10.2.80.199
51	10.2.80.200/30	10.2.80.201 – 10.2.80.202	10.2.80.203
52	10.2.80.204/30	10.2.80.205 – 10.2.80.206	10.2.80.207
53	10.2.80.208/30	10.2.80.209 – 10.2.80.210	10.2.80.211
54	10.2.80.212/30	10.2.80.213 – 10.2.80.214	10.2.80.215
55	10.2.80.216/30	10.2.80.217 – 10.2.80.218	10.2.80.219
56	10.2.80.220/30	10.2.80.221 – 10.2.80.222	10.2.80.223
57	10.2.80.224/30	10.2.80.225 – 10.2.80.226	10.2.80.227
58	10.2.80.228/30	10.2.80.229 – 10.2.80.230	10.2.80.231
59	10.2.80.232/30	10.2.80.233 – 10.2.80.234	10.2.80.235
60	10.2.80.236/30	10.2.80.237 – 10.2.80.238	10.2.80.239
61	10.2.80.240/30	10.2.80.241 – 10.2.80.242	10.2.80.243
62	10.2.80.244/30	10.2.80.245 – 10.2.80.246	10.2.80.247
63	10.2.80.248/30	10.2.80.249 – 10.2.80.250	10.2.80.251
64	10.2.80.252/30	10.2.80.253 – 10.2.80.254	10.2.80.255
65	10.2.81.0/30	10.2.81.1 – 10.2.81.2	10.2.81.3
66	10.2.81.4/30	10.2.81.5 – 10.2.81.6	10.2.81.7
67	10.2.81.8/30	10.2.81.9 – 10.2.81.10	10.2.81.11
68	10.2.81.12/30	10.2.81.13 – 10.2.81.14	10.2.81.15
69	10.2.81.16/30	10.2.81.17 – 10.2.81.18	10.2.81.19
70	10.2.81.20/30	10.2.81.21 – 10.2.81.22	10.2.81.23
71	10.2.81.24/30	10.2.81.25 – 10.2.81.26	10.2.81.27
72	10.2.81.28/30	10.2.81.29 – 10.2.81.30	10.2.81.31
73	10.2.81.32/30	10.2.81.33 – 10.2.81.34	10.2.81.35
74	10.2.81.36/30	10.2.81.37 – 10.2.81.38	10.2.81.39
75	10.2.81.40/30	10.2.81.41 – 10.2.81.42	10.2.81.43
76	10.2.81.44/30	10.2.81.45 – 10.2.81.46	10.2.81.47
77	10.2.81.48/30	10.2.81.49 – 10.2.81.50	10.2.81.51
78	10.2.81.52/30	10.2.81.53 – 10.2.81.54	10.2.81.55
79	10.2.81.56/30	10.2.81.57 – 10.2.81.58	10.2.81.59
80	10.2.81.60/30	10.2.81.61 – 10.2.81.62	10.2.81.63
81	10.2.81.64/30	10.2.81.65 – 10.2.81.66	10.2.81.67
82	10.2.81.68/30	10.2.81.69 – 10.2.81.70	10.2.81.71
83	10.2.81.72/30	10.2.81.73 – 10.2.81.74	10.2.81.75
84	10.2.81.76/30	10.2.81.77 – 10.2.81.78	10.2.81.79
85	10.2.81.80/30	10.2.81.81 – 10.2.81.82	10.2.81.83
86	10.2.81.84/30	10.2.81.85 – 10.2.81.86	10.2.81.87
87	10.2.81.88/30	10.2.81.89 – 10.2.81.90	10.2.81.91
88	10.2.81.92/30	10.2.81.93 – 10.2.81.94	10.2.81.95
89	10.2.81.96/30	10.2.81.97 – 10.2.81.98	10.2.81.99
90	10.2.81.100/30	10.2.81.101 – 10.2.81.102	10.2.81.103
91	10.2.81.104/30	10.2.81.105 – 10.2.81.106	10.2.81.107
92	10.2.81.108/30	10.2.81.109 – 10.2.81.110	10.2.81.111
93	10.2.81.112/30	10.2.81.113 – 10.2.81.114	10.2.81.115
94	10.2.81.116/30	10.2.81.117 – 10.2.81.118	10.2.81.119
95	10.2.81.120/30	10.2.81.121 – 10.2.81.122	10.2.81.123
96	10.2.81.124/30	10.2.81.125 – 10.2.81.126	10.2.81.127
97	10.2.81.128/30	10.2.81.129 – 10.2.81.130	10.2.81.131
98	10.2.81.132/30	10.2.81.133 – 10.2.81.134	10.2.81.135
99	10.2.81.136/30	10.2.81.137 – 10.2.81.138	10.2.81.139
100	10.2.81.140/30	10.2.81.141 – 10.2.81.142	10.2.81.143
101	10.2.81.144/30	10.2.81.145 – 10.2.81.146	10.2.81.147
102	10.2.81.148/30	10.2.81.149 – 10.2.81.150	10.2.81.151
103	10.2.81.152/30	10.2.81.153 – 10.2.81.154	10.2.81.155
104	10.2.81.156/30	10.2.81.157 – 10.2.81.158	10.2.81.159
105	10.2.81.160/30	10.2.81.161 – 10.2.81.162	10.2.81.163
106	10.2.81.164/30	10.2.81.165 – 10.2.81.166	10.2.81.167
107	10.2.81.168/30	10.2.81.169 – 10.2.81.170	10.2.81.171
108	10.2.81.172/30	10.2.81.173 – 10.2.81.174	10.2.81.175
109	10.2.81.176/30	10.2.81.177 – 10.2.81.178	10.2.81.179
110	10.2.81.180/30	10.2.81.181 – 10.2.81.182	10.2.81.183
111	10.2.81.184/30	10.2.81.185 – 10.2.81.186	10.2.81.187
112	10.2.81.188/30	10.2.81.189 – 10.2.81.190	10.2.81.191
113	10.2.81.192/30	10.2.81.193 – 10.2.81.194	10.2.81.195
114	10.2.81.196/30	10.2.81.197 – 10.2.81.198	10.2.81.199
115	10.2.81.200/30	10.2.81.201 – 10.2.81.202	10.2.81.203
116	10.2.81.204/30	10.2.81.205 – 10.2.81.206	10.2.81.207
117	10.2.81.208/30	10.2.81.209 – 10.2.81.210	10.2.81.211
118	10.2.81.212/30	10.2.81.213 – 10.2.81.214	10.2.81.215
119	10.2.81.216/30	10.2.81.217 – 10.2.81.218	10.2.81.219
120	10.2.81.220/30	10.2.81.221 – 10.2.81.222	10.2.81.223
121	10.2.81.224/30	10.2.81.225 – 10.2.81.226	10.2.81.227
122	10.2.81.228/30	10.2.81.229 – 10.2.81.230	10.2.81.231
123	10.2.81.232/30	10.2.81.233 – 10.2.81.234	10.2.81.235
124	10.2.81.236/30	10.2.81.237 – 10.2.81.238	10.2.81.239
125	10.2.81.240/30	10.2.81.241 – 10.2.81.242	10.2.81.243
126	10.2.81.244/30	10.2.81.245 – 10.2.81.246	10.2.81.247
127	10.2.81.248/30	10.2.81.249 – 10.2.81.250	10.2.81.251
128	10.2.81.252/30	10.2.81.253 – 10.2.81.254	10.2.81.255

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 →