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)10.27.4.0/23

network10.27.4.0/23

broadcast10.27.5.255

first host10.27.4.1

last host10.27.5.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.27.4.0/23

address00001010.00011011.00000100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00011011.00000100.00000000

broadcast00001010.00011011.00000101.11111111

green = network part, grey = host part

hex0x0a1b0400

decimal169542656

reverse dns0.4.27.10.in-addr.arpa

ipv4-mapped::ffff:a1b:400

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.27.4.0/30	10.27.4.1 – 10.27.4.2	10.27.4.3
2	10.27.4.4/30	10.27.4.5 – 10.27.4.6	10.27.4.7
3	10.27.4.8/30	10.27.4.9 – 10.27.4.10	10.27.4.11
4	10.27.4.12/30	10.27.4.13 – 10.27.4.14	10.27.4.15
5	10.27.4.16/30	10.27.4.17 – 10.27.4.18	10.27.4.19
6	10.27.4.20/30	10.27.4.21 – 10.27.4.22	10.27.4.23
7	10.27.4.24/30	10.27.4.25 – 10.27.4.26	10.27.4.27
8	10.27.4.28/30	10.27.4.29 – 10.27.4.30	10.27.4.31
9	10.27.4.32/30	10.27.4.33 – 10.27.4.34	10.27.4.35
10	10.27.4.36/30	10.27.4.37 – 10.27.4.38	10.27.4.39
11	10.27.4.40/30	10.27.4.41 – 10.27.4.42	10.27.4.43
12	10.27.4.44/30	10.27.4.45 – 10.27.4.46	10.27.4.47
13	10.27.4.48/30	10.27.4.49 – 10.27.4.50	10.27.4.51
14	10.27.4.52/30	10.27.4.53 – 10.27.4.54	10.27.4.55
15	10.27.4.56/30	10.27.4.57 – 10.27.4.58	10.27.4.59
16	10.27.4.60/30	10.27.4.61 – 10.27.4.62	10.27.4.63
17	10.27.4.64/30	10.27.4.65 – 10.27.4.66	10.27.4.67
18	10.27.4.68/30	10.27.4.69 – 10.27.4.70	10.27.4.71
19	10.27.4.72/30	10.27.4.73 – 10.27.4.74	10.27.4.75
20	10.27.4.76/30	10.27.4.77 – 10.27.4.78	10.27.4.79
21	10.27.4.80/30	10.27.4.81 – 10.27.4.82	10.27.4.83
22	10.27.4.84/30	10.27.4.85 – 10.27.4.86	10.27.4.87
23	10.27.4.88/30	10.27.4.89 – 10.27.4.90	10.27.4.91
24	10.27.4.92/30	10.27.4.93 – 10.27.4.94	10.27.4.95
25	10.27.4.96/30	10.27.4.97 – 10.27.4.98	10.27.4.99
26	10.27.4.100/30	10.27.4.101 – 10.27.4.102	10.27.4.103
27	10.27.4.104/30	10.27.4.105 – 10.27.4.106	10.27.4.107
28	10.27.4.108/30	10.27.4.109 – 10.27.4.110	10.27.4.111
29	10.27.4.112/30	10.27.4.113 – 10.27.4.114	10.27.4.115
30	10.27.4.116/30	10.27.4.117 – 10.27.4.118	10.27.4.119
31	10.27.4.120/30	10.27.4.121 – 10.27.4.122	10.27.4.123
32	10.27.4.124/30	10.27.4.125 – 10.27.4.126	10.27.4.127
33	10.27.4.128/30	10.27.4.129 – 10.27.4.130	10.27.4.131
34	10.27.4.132/30	10.27.4.133 – 10.27.4.134	10.27.4.135
35	10.27.4.136/30	10.27.4.137 – 10.27.4.138	10.27.4.139
36	10.27.4.140/30	10.27.4.141 – 10.27.4.142	10.27.4.143
37	10.27.4.144/30	10.27.4.145 – 10.27.4.146	10.27.4.147
38	10.27.4.148/30	10.27.4.149 – 10.27.4.150	10.27.4.151
39	10.27.4.152/30	10.27.4.153 – 10.27.4.154	10.27.4.155
40	10.27.4.156/30	10.27.4.157 – 10.27.4.158	10.27.4.159
41	10.27.4.160/30	10.27.4.161 – 10.27.4.162	10.27.4.163
42	10.27.4.164/30	10.27.4.165 – 10.27.4.166	10.27.4.167
43	10.27.4.168/30	10.27.4.169 – 10.27.4.170	10.27.4.171
44	10.27.4.172/30	10.27.4.173 – 10.27.4.174	10.27.4.175
45	10.27.4.176/30	10.27.4.177 – 10.27.4.178	10.27.4.179
46	10.27.4.180/30	10.27.4.181 – 10.27.4.182	10.27.4.183
47	10.27.4.184/30	10.27.4.185 – 10.27.4.186	10.27.4.187
48	10.27.4.188/30	10.27.4.189 – 10.27.4.190	10.27.4.191
49	10.27.4.192/30	10.27.4.193 – 10.27.4.194	10.27.4.195
50	10.27.4.196/30	10.27.4.197 – 10.27.4.198	10.27.4.199
51	10.27.4.200/30	10.27.4.201 – 10.27.4.202	10.27.4.203
52	10.27.4.204/30	10.27.4.205 – 10.27.4.206	10.27.4.207
53	10.27.4.208/30	10.27.4.209 – 10.27.4.210	10.27.4.211
54	10.27.4.212/30	10.27.4.213 – 10.27.4.214	10.27.4.215
55	10.27.4.216/30	10.27.4.217 – 10.27.4.218	10.27.4.219
56	10.27.4.220/30	10.27.4.221 – 10.27.4.222	10.27.4.223
57	10.27.4.224/30	10.27.4.225 – 10.27.4.226	10.27.4.227
58	10.27.4.228/30	10.27.4.229 – 10.27.4.230	10.27.4.231
59	10.27.4.232/30	10.27.4.233 – 10.27.4.234	10.27.4.235
60	10.27.4.236/30	10.27.4.237 – 10.27.4.238	10.27.4.239
61	10.27.4.240/30	10.27.4.241 – 10.27.4.242	10.27.4.243
62	10.27.4.244/30	10.27.4.245 – 10.27.4.246	10.27.4.247
63	10.27.4.248/30	10.27.4.249 – 10.27.4.250	10.27.4.251
64	10.27.4.252/30	10.27.4.253 – 10.27.4.254	10.27.4.255
65	10.27.5.0/30	10.27.5.1 – 10.27.5.2	10.27.5.3
66	10.27.5.4/30	10.27.5.5 – 10.27.5.6	10.27.5.7
67	10.27.5.8/30	10.27.5.9 – 10.27.5.10	10.27.5.11
68	10.27.5.12/30	10.27.5.13 – 10.27.5.14	10.27.5.15
69	10.27.5.16/30	10.27.5.17 – 10.27.5.18	10.27.5.19
70	10.27.5.20/30	10.27.5.21 – 10.27.5.22	10.27.5.23
71	10.27.5.24/30	10.27.5.25 – 10.27.5.26	10.27.5.27
72	10.27.5.28/30	10.27.5.29 – 10.27.5.30	10.27.5.31
73	10.27.5.32/30	10.27.5.33 – 10.27.5.34	10.27.5.35
74	10.27.5.36/30	10.27.5.37 – 10.27.5.38	10.27.5.39
75	10.27.5.40/30	10.27.5.41 – 10.27.5.42	10.27.5.43
76	10.27.5.44/30	10.27.5.45 – 10.27.5.46	10.27.5.47
77	10.27.5.48/30	10.27.5.49 – 10.27.5.50	10.27.5.51
78	10.27.5.52/30	10.27.5.53 – 10.27.5.54	10.27.5.55
79	10.27.5.56/30	10.27.5.57 – 10.27.5.58	10.27.5.59
80	10.27.5.60/30	10.27.5.61 – 10.27.5.62	10.27.5.63
81	10.27.5.64/30	10.27.5.65 – 10.27.5.66	10.27.5.67
82	10.27.5.68/30	10.27.5.69 – 10.27.5.70	10.27.5.71
83	10.27.5.72/30	10.27.5.73 – 10.27.5.74	10.27.5.75
84	10.27.5.76/30	10.27.5.77 – 10.27.5.78	10.27.5.79
85	10.27.5.80/30	10.27.5.81 – 10.27.5.82	10.27.5.83
86	10.27.5.84/30	10.27.5.85 – 10.27.5.86	10.27.5.87
87	10.27.5.88/30	10.27.5.89 – 10.27.5.90	10.27.5.91
88	10.27.5.92/30	10.27.5.93 – 10.27.5.94	10.27.5.95
89	10.27.5.96/30	10.27.5.97 – 10.27.5.98	10.27.5.99
90	10.27.5.100/30	10.27.5.101 – 10.27.5.102	10.27.5.103
91	10.27.5.104/30	10.27.5.105 – 10.27.5.106	10.27.5.107
92	10.27.5.108/30	10.27.5.109 – 10.27.5.110	10.27.5.111
93	10.27.5.112/30	10.27.5.113 – 10.27.5.114	10.27.5.115
94	10.27.5.116/30	10.27.5.117 – 10.27.5.118	10.27.5.119
95	10.27.5.120/30	10.27.5.121 – 10.27.5.122	10.27.5.123
96	10.27.5.124/30	10.27.5.125 – 10.27.5.126	10.27.5.127
97	10.27.5.128/30	10.27.5.129 – 10.27.5.130	10.27.5.131
98	10.27.5.132/30	10.27.5.133 – 10.27.5.134	10.27.5.135
99	10.27.5.136/30	10.27.5.137 – 10.27.5.138	10.27.5.139
100	10.27.5.140/30	10.27.5.141 – 10.27.5.142	10.27.5.143
101	10.27.5.144/30	10.27.5.145 – 10.27.5.146	10.27.5.147
102	10.27.5.148/30	10.27.5.149 – 10.27.5.150	10.27.5.151
103	10.27.5.152/30	10.27.5.153 – 10.27.5.154	10.27.5.155
104	10.27.5.156/30	10.27.5.157 – 10.27.5.158	10.27.5.159
105	10.27.5.160/30	10.27.5.161 – 10.27.5.162	10.27.5.163
106	10.27.5.164/30	10.27.5.165 – 10.27.5.166	10.27.5.167
107	10.27.5.168/30	10.27.5.169 – 10.27.5.170	10.27.5.171
108	10.27.5.172/30	10.27.5.173 – 10.27.5.174	10.27.5.175
109	10.27.5.176/30	10.27.5.177 – 10.27.5.178	10.27.5.179
110	10.27.5.180/30	10.27.5.181 – 10.27.5.182	10.27.5.183
111	10.27.5.184/30	10.27.5.185 – 10.27.5.186	10.27.5.187
112	10.27.5.188/30	10.27.5.189 – 10.27.5.190	10.27.5.191
113	10.27.5.192/30	10.27.5.193 – 10.27.5.194	10.27.5.195
114	10.27.5.196/30	10.27.5.197 – 10.27.5.198	10.27.5.199
115	10.27.5.200/30	10.27.5.201 – 10.27.5.202	10.27.5.203
116	10.27.5.204/30	10.27.5.205 – 10.27.5.206	10.27.5.207
117	10.27.5.208/30	10.27.5.209 – 10.27.5.210	10.27.5.211
118	10.27.5.212/30	10.27.5.213 – 10.27.5.214	10.27.5.215
119	10.27.5.216/30	10.27.5.217 – 10.27.5.218	10.27.5.219
120	10.27.5.220/30	10.27.5.221 – 10.27.5.222	10.27.5.223
121	10.27.5.224/30	10.27.5.225 – 10.27.5.226	10.27.5.227
122	10.27.5.228/30	10.27.5.229 – 10.27.5.230	10.27.5.231
123	10.27.5.232/30	10.27.5.233 – 10.27.5.234	10.27.5.235
124	10.27.5.236/30	10.27.5.237 – 10.27.5.238	10.27.5.239
125	10.27.5.240/30	10.27.5.241 – 10.27.5.242	10.27.5.243
126	10.27.5.244/30	10.27.5.245 – 10.27.5.246	10.27.5.247
127	10.27.5.248/30	10.27.5.249 – 10.27.5.250	10.27.5.251
128	10.27.5.252/30	10.27.5.253 – 10.27.5.254	10.27.5.255

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 →