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)10.2.136.0/23

network10.2.136.0/23

broadcast10.2.137.255

first host10.2.136.1

last host10.2.137.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.136.0/23

address00001010.00000010.10001000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.10001000.00000000

broadcast00001010.00000010.10001001.11111111

green = network part, grey = host part

hex0x0a028800

decimal167938048

reverse dns0.136.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8800

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.136.0/30	10.2.136.1 – 10.2.136.2	10.2.136.3
2	10.2.136.4/30	10.2.136.5 – 10.2.136.6	10.2.136.7
3	10.2.136.8/30	10.2.136.9 – 10.2.136.10	10.2.136.11
4	10.2.136.12/30	10.2.136.13 – 10.2.136.14	10.2.136.15
5	10.2.136.16/30	10.2.136.17 – 10.2.136.18	10.2.136.19
6	10.2.136.20/30	10.2.136.21 – 10.2.136.22	10.2.136.23
7	10.2.136.24/30	10.2.136.25 – 10.2.136.26	10.2.136.27
8	10.2.136.28/30	10.2.136.29 – 10.2.136.30	10.2.136.31
9	10.2.136.32/30	10.2.136.33 – 10.2.136.34	10.2.136.35
10	10.2.136.36/30	10.2.136.37 – 10.2.136.38	10.2.136.39
11	10.2.136.40/30	10.2.136.41 – 10.2.136.42	10.2.136.43
12	10.2.136.44/30	10.2.136.45 – 10.2.136.46	10.2.136.47
13	10.2.136.48/30	10.2.136.49 – 10.2.136.50	10.2.136.51
14	10.2.136.52/30	10.2.136.53 – 10.2.136.54	10.2.136.55
15	10.2.136.56/30	10.2.136.57 – 10.2.136.58	10.2.136.59
16	10.2.136.60/30	10.2.136.61 – 10.2.136.62	10.2.136.63
17	10.2.136.64/30	10.2.136.65 – 10.2.136.66	10.2.136.67
18	10.2.136.68/30	10.2.136.69 – 10.2.136.70	10.2.136.71
19	10.2.136.72/30	10.2.136.73 – 10.2.136.74	10.2.136.75
20	10.2.136.76/30	10.2.136.77 – 10.2.136.78	10.2.136.79
21	10.2.136.80/30	10.2.136.81 – 10.2.136.82	10.2.136.83
22	10.2.136.84/30	10.2.136.85 – 10.2.136.86	10.2.136.87
23	10.2.136.88/30	10.2.136.89 – 10.2.136.90	10.2.136.91
24	10.2.136.92/30	10.2.136.93 – 10.2.136.94	10.2.136.95
25	10.2.136.96/30	10.2.136.97 – 10.2.136.98	10.2.136.99
26	10.2.136.100/30	10.2.136.101 – 10.2.136.102	10.2.136.103
27	10.2.136.104/30	10.2.136.105 – 10.2.136.106	10.2.136.107
28	10.2.136.108/30	10.2.136.109 – 10.2.136.110	10.2.136.111
29	10.2.136.112/30	10.2.136.113 – 10.2.136.114	10.2.136.115
30	10.2.136.116/30	10.2.136.117 – 10.2.136.118	10.2.136.119
31	10.2.136.120/30	10.2.136.121 – 10.2.136.122	10.2.136.123
32	10.2.136.124/30	10.2.136.125 – 10.2.136.126	10.2.136.127
33	10.2.136.128/30	10.2.136.129 – 10.2.136.130	10.2.136.131
34	10.2.136.132/30	10.2.136.133 – 10.2.136.134	10.2.136.135
35	10.2.136.136/30	10.2.136.137 – 10.2.136.138	10.2.136.139
36	10.2.136.140/30	10.2.136.141 – 10.2.136.142	10.2.136.143
37	10.2.136.144/30	10.2.136.145 – 10.2.136.146	10.2.136.147
38	10.2.136.148/30	10.2.136.149 – 10.2.136.150	10.2.136.151
39	10.2.136.152/30	10.2.136.153 – 10.2.136.154	10.2.136.155
40	10.2.136.156/30	10.2.136.157 – 10.2.136.158	10.2.136.159
41	10.2.136.160/30	10.2.136.161 – 10.2.136.162	10.2.136.163
42	10.2.136.164/30	10.2.136.165 – 10.2.136.166	10.2.136.167
43	10.2.136.168/30	10.2.136.169 – 10.2.136.170	10.2.136.171
44	10.2.136.172/30	10.2.136.173 – 10.2.136.174	10.2.136.175
45	10.2.136.176/30	10.2.136.177 – 10.2.136.178	10.2.136.179
46	10.2.136.180/30	10.2.136.181 – 10.2.136.182	10.2.136.183
47	10.2.136.184/30	10.2.136.185 – 10.2.136.186	10.2.136.187
48	10.2.136.188/30	10.2.136.189 – 10.2.136.190	10.2.136.191
49	10.2.136.192/30	10.2.136.193 – 10.2.136.194	10.2.136.195
50	10.2.136.196/30	10.2.136.197 – 10.2.136.198	10.2.136.199
51	10.2.136.200/30	10.2.136.201 – 10.2.136.202	10.2.136.203
52	10.2.136.204/30	10.2.136.205 – 10.2.136.206	10.2.136.207
53	10.2.136.208/30	10.2.136.209 – 10.2.136.210	10.2.136.211
54	10.2.136.212/30	10.2.136.213 – 10.2.136.214	10.2.136.215
55	10.2.136.216/30	10.2.136.217 – 10.2.136.218	10.2.136.219
56	10.2.136.220/30	10.2.136.221 – 10.2.136.222	10.2.136.223
57	10.2.136.224/30	10.2.136.225 – 10.2.136.226	10.2.136.227
58	10.2.136.228/30	10.2.136.229 – 10.2.136.230	10.2.136.231
59	10.2.136.232/30	10.2.136.233 – 10.2.136.234	10.2.136.235
60	10.2.136.236/30	10.2.136.237 – 10.2.136.238	10.2.136.239
61	10.2.136.240/30	10.2.136.241 – 10.2.136.242	10.2.136.243
62	10.2.136.244/30	10.2.136.245 – 10.2.136.246	10.2.136.247
63	10.2.136.248/30	10.2.136.249 – 10.2.136.250	10.2.136.251
64	10.2.136.252/30	10.2.136.253 – 10.2.136.254	10.2.136.255
65	10.2.137.0/30	10.2.137.1 – 10.2.137.2	10.2.137.3
66	10.2.137.4/30	10.2.137.5 – 10.2.137.6	10.2.137.7
67	10.2.137.8/30	10.2.137.9 – 10.2.137.10	10.2.137.11
68	10.2.137.12/30	10.2.137.13 – 10.2.137.14	10.2.137.15
69	10.2.137.16/30	10.2.137.17 – 10.2.137.18	10.2.137.19
70	10.2.137.20/30	10.2.137.21 – 10.2.137.22	10.2.137.23
71	10.2.137.24/30	10.2.137.25 – 10.2.137.26	10.2.137.27
72	10.2.137.28/30	10.2.137.29 – 10.2.137.30	10.2.137.31
73	10.2.137.32/30	10.2.137.33 – 10.2.137.34	10.2.137.35
74	10.2.137.36/30	10.2.137.37 – 10.2.137.38	10.2.137.39
75	10.2.137.40/30	10.2.137.41 – 10.2.137.42	10.2.137.43
76	10.2.137.44/30	10.2.137.45 – 10.2.137.46	10.2.137.47
77	10.2.137.48/30	10.2.137.49 – 10.2.137.50	10.2.137.51
78	10.2.137.52/30	10.2.137.53 – 10.2.137.54	10.2.137.55
79	10.2.137.56/30	10.2.137.57 – 10.2.137.58	10.2.137.59
80	10.2.137.60/30	10.2.137.61 – 10.2.137.62	10.2.137.63
81	10.2.137.64/30	10.2.137.65 – 10.2.137.66	10.2.137.67
82	10.2.137.68/30	10.2.137.69 – 10.2.137.70	10.2.137.71
83	10.2.137.72/30	10.2.137.73 – 10.2.137.74	10.2.137.75
84	10.2.137.76/30	10.2.137.77 – 10.2.137.78	10.2.137.79
85	10.2.137.80/30	10.2.137.81 – 10.2.137.82	10.2.137.83
86	10.2.137.84/30	10.2.137.85 – 10.2.137.86	10.2.137.87
87	10.2.137.88/30	10.2.137.89 – 10.2.137.90	10.2.137.91
88	10.2.137.92/30	10.2.137.93 – 10.2.137.94	10.2.137.95
89	10.2.137.96/30	10.2.137.97 – 10.2.137.98	10.2.137.99
90	10.2.137.100/30	10.2.137.101 – 10.2.137.102	10.2.137.103
91	10.2.137.104/30	10.2.137.105 – 10.2.137.106	10.2.137.107
92	10.2.137.108/30	10.2.137.109 – 10.2.137.110	10.2.137.111
93	10.2.137.112/30	10.2.137.113 – 10.2.137.114	10.2.137.115
94	10.2.137.116/30	10.2.137.117 – 10.2.137.118	10.2.137.119
95	10.2.137.120/30	10.2.137.121 – 10.2.137.122	10.2.137.123
96	10.2.137.124/30	10.2.137.125 – 10.2.137.126	10.2.137.127
97	10.2.137.128/30	10.2.137.129 – 10.2.137.130	10.2.137.131
98	10.2.137.132/30	10.2.137.133 – 10.2.137.134	10.2.137.135
99	10.2.137.136/30	10.2.137.137 – 10.2.137.138	10.2.137.139
100	10.2.137.140/30	10.2.137.141 – 10.2.137.142	10.2.137.143
101	10.2.137.144/30	10.2.137.145 – 10.2.137.146	10.2.137.147
102	10.2.137.148/30	10.2.137.149 – 10.2.137.150	10.2.137.151
103	10.2.137.152/30	10.2.137.153 – 10.2.137.154	10.2.137.155
104	10.2.137.156/30	10.2.137.157 – 10.2.137.158	10.2.137.159
105	10.2.137.160/30	10.2.137.161 – 10.2.137.162	10.2.137.163
106	10.2.137.164/30	10.2.137.165 – 10.2.137.166	10.2.137.167
107	10.2.137.168/30	10.2.137.169 – 10.2.137.170	10.2.137.171
108	10.2.137.172/30	10.2.137.173 – 10.2.137.174	10.2.137.175
109	10.2.137.176/30	10.2.137.177 – 10.2.137.178	10.2.137.179
110	10.2.137.180/30	10.2.137.181 – 10.2.137.182	10.2.137.183
111	10.2.137.184/30	10.2.137.185 – 10.2.137.186	10.2.137.187
112	10.2.137.188/30	10.2.137.189 – 10.2.137.190	10.2.137.191
113	10.2.137.192/30	10.2.137.193 – 10.2.137.194	10.2.137.195
114	10.2.137.196/30	10.2.137.197 – 10.2.137.198	10.2.137.199
115	10.2.137.200/30	10.2.137.201 – 10.2.137.202	10.2.137.203
116	10.2.137.204/30	10.2.137.205 – 10.2.137.206	10.2.137.207
117	10.2.137.208/30	10.2.137.209 – 10.2.137.210	10.2.137.211
118	10.2.137.212/30	10.2.137.213 – 10.2.137.214	10.2.137.215
119	10.2.137.216/30	10.2.137.217 – 10.2.137.218	10.2.137.219
120	10.2.137.220/30	10.2.137.221 – 10.2.137.222	10.2.137.223
121	10.2.137.224/30	10.2.137.225 – 10.2.137.226	10.2.137.227
122	10.2.137.228/30	10.2.137.229 – 10.2.137.230	10.2.137.231
123	10.2.137.232/30	10.2.137.233 – 10.2.137.234	10.2.137.235
124	10.2.137.236/30	10.2.137.237 – 10.2.137.238	10.2.137.239
125	10.2.137.240/30	10.2.137.241 – 10.2.137.242	10.2.137.243
126	10.2.137.244/30	10.2.137.245 – 10.2.137.246	10.2.137.247
127	10.2.137.248/30	10.2.137.249 – 10.2.137.250	10.2.137.251
128	10.2.137.252/30	10.2.137.253 – 10.2.137.254	10.2.137.255

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 →