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)10.158.48.0/23

network10.158.48.0/23

broadcast10.158.49.255

first host10.158.48.1

last host10.158.49.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.158.48.0/23

address00001010.10011110.00110000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10011110.00110000.00000000

broadcast00001010.10011110.00110001.11111111

green = network part, grey = host part

hex0x0a9e3000

decimal178139136

reverse dns0.48.158.10.in-addr.arpa

ipv4-mapped::ffff:a9e:3000

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.158.48.0/30	10.158.48.1 – 10.158.48.2	10.158.48.3
2	10.158.48.4/30	10.158.48.5 – 10.158.48.6	10.158.48.7
3	10.158.48.8/30	10.158.48.9 – 10.158.48.10	10.158.48.11
4	10.158.48.12/30	10.158.48.13 – 10.158.48.14	10.158.48.15
5	10.158.48.16/30	10.158.48.17 – 10.158.48.18	10.158.48.19
6	10.158.48.20/30	10.158.48.21 – 10.158.48.22	10.158.48.23
7	10.158.48.24/30	10.158.48.25 – 10.158.48.26	10.158.48.27
8	10.158.48.28/30	10.158.48.29 – 10.158.48.30	10.158.48.31
9	10.158.48.32/30	10.158.48.33 – 10.158.48.34	10.158.48.35
10	10.158.48.36/30	10.158.48.37 – 10.158.48.38	10.158.48.39
11	10.158.48.40/30	10.158.48.41 – 10.158.48.42	10.158.48.43
12	10.158.48.44/30	10.158.48.45 – 10.158.48.46	10.158.48.47
13	10.158.48.48/30	10.158.48.49 – 10.158.48.50	10.158.48.51
14	10.158.48.52/30	10.158.48.53 – 10.158.48.54	10.158.48.55
15	10.158.48.56/30	10.158.48.57 – 10.158.48.58	10.158.48.59
16	10.158.48.60/30	10.158.48.61 – 10.158.48.62	10.158.48.63
17	10.158.48.64/30	10.158.48.65 – 10.158.48.66	10.158.48.67
18	10.158.48.68/30	10.158.48.69 – 10.158.48.70	10.158.48.71
19	10.158.48.72/30	10.158.48.73 – 10.158.48.74	10.158.48.75
20	10.158.48.76/30	10.158.48.77 – 10.158.48.78	10.158.48.79
21	10.158.48.80/30	10.158.48.81 – 10.158.48.82	10.158.48.83
22	10.158.48.84/30	10.158.48.85 – 10.158.48.86	10.158.48.87
23	10.158.48.88/30	10.158.48.89 – 10.158.48.90	10.158.48.91
24	10.158.48.92/30	10.158.48.93 – 10.158.48.94	10.158.48.95
25	10.158.48.96/30	10.158.48.97 – 10.158.48.98	10.158.48.99
26	10.158.48.100/30	10.158.48.101 – 10.158.48.102	10.158.48.103
27	10.158.48.104/30	10.158.48.105 – 10.158.48.106	10.158.48.107
28	10.158.48.108/30	10.158.48.109 – 10.158.48.110	10.158.48.111
29	10.158.48.112/30	10.158.48.113 – 10.158.48.114	10.158.48.115
30	10.158.48.116/30	10.158.48.117 – 10.158.48.118	10.158.48.119
31	10.158.48.120/30	10.158.48.121 – 10.158.48.122	10.158.48.123
32	10.158.48.124/30	10.158.48.125 – 10.158.48.126	10.158.48.127
33	10.158.48.128/30	10.158.48.129 – 10.158.48.130	10.158.48.131
34	10.158.48.132/30	10.158.48.133 – 10.158.48.134	10.158.48.135
35	10.158.48.136/30	10.158.48.137 – 10.158.48.138	10.158.48.139
36	10.158.48.140/30	10.158.48.141 – 10.158.48.142	10.158.48.143
37	10.158.48.144/30	10.158.48.145 – 10.158.48.146	10.158.48.147
38	10.158.48.148/30	10.158.48.149 – 10.158.48.150	10.158.48.151
39	10.158.48.152/30	10.158.48.153 – 10.158.48.154	10.158.48.155
40	10.158.48.156/30	10.158.48.157 – 10.158.48.158	10.158.48.159
41	10.158.48.160/30	10.158.48.161 – 10.158.48.162	10.158.48.163
42	10.158.48.164/30	10.158.48.165 – 10.158.48.166	10.158.48.167
43	10.158.48.168/30	10.158.48.169 – 10.158.48.170	10.158.48.171
44	10.158.48.172/30	10.158.48.173 – 10.158.48.174	10.158.48.175
45	10.158.48.176/30	10.158.48.177 – 10.158.48.178	10.158.48.179
46	10.158.48.180/30	10.158.48.181 – 10.158.48.182	10.158.48.183
47	10.158.48.184/30	10.158.48.185 – 10.158.48.186	10.158.48.187
48	10.158.48.188/30	10.158.48.189 – 10.158.48.190	10.158.48.191
49	10.158.48.192/30	10.158.48.193 – 10.158.48.194	10.158.48.195
50	10.158.48.196/30	10.158.48.197 – 10.158.48.198	10.158.48.199
51	10.158.48.200/30	10.158.48.201 – 10.158.48.202	10.158.48.203
52	10.158.48.204/30	10.158.48.205 – 10.158.48.206	10.158.48.207
53	10.158.48.208/30	10.158.48.209 – 10.158.48.210	10.158.48.211
54	10.158.48.212/30	10.158.48.213 – 10.158.48.214	10.158.48.215
55	10.158.48.216/30	10.158.48.217 – 10.158.48.218	10.158.48.219
56	10.158.48.220/30	10.158.48.221 – 10.158.48.222	10.158.48.223
57	10.158.48.224/30	10.158.48.225 – 10.158.48.226	10.158.48.227
58	10.158.48.228/30	10.158.48.229 – 10.158.48.230	10.158.48.231
59	10.158.48.232/30	10.158.48.233 – 10.158.48.234	10.158.48.235
60	10.158.48.236/30	10.158.48.237 – 10.158.48.238	10.158.48.239
61	10.158.48.240/30	10.158.48.241 – 10.158.48.242	10.158.48.243
62	10.158.48.244/30	10.158.48.245 – 10.158.48.246	10.158.48.247
63	10.158.48.248/30	10.158.48.249 – 10.158.48.250	10.158.48.251
64	10.158.48.252/30	10.158.48.253 – 10.158.48.254	10.158.48.255
65	10.158.49.0/30	10.158.49.1 – 10.158.49.2	10.158.49.3
66	10.158.49.4/30	10.158.49.5 – 10.158.49.6	10.158.49.7
67	10.158.49.8/30	10.158.49.9 – 10.158.49.10	10.158.49.11
68	10.158.49.12/30	10.158.49.13 – 10.158.49.14	10.158.49.15
69	10.158.49.16/30	10.158.49.17 – 10.158.49.18	10.158.49.19
70	10.158.49.20/30	10.158.49.21 – 10.158.49.22	10.158.49.23
71	10.158.49.24/30	10.158.49.25 – 10.158.49.26	10.158.49.27
72	10.158.49.28/30	10.158.49.29 – 10.158.49.30	10.158.49.31
73	10.158.49.32/30	10.158.49.33 – 10.158.49.34	10.158.49.35
74	10.158.49.36/30	10.158.49.37 – 10.158.49.38	10.158.49.39
75	10.158.49.40/30	10.158.49.41 – 10.158.49.42	10.158.49.43
76	10.158.49.44/30	10.158.49.45 – 10.158.49.46	10.158.49.47
77	10.158.49.48/30	10.158.49.49 – 10.158.49.50	10.158.49.51
78	10.158.49.52/30	10.158.49.53 – 10.158.49.54	10.158.49.55
79	10.158.49.56/30	10.158.49.57 – 10.158.49.58	10.158.49.59
80	10.158.49.60/30	10.158.49.61 – 10.158.49.62	10.158.49.63
81	10.158.49.64/30	10.158.49.65 – 10.158.49.66	10.158.49.67
82	10.158.49.68/30	10.158.49.69 – 10.158.49.70	10.158.49.71
83	10.158.49.72/30	10.158.49.73 – 10.158.49.74	10.158.49.75
84	10.158.49.76/30	10.158.49.77 – 10.158.49.78	10.158.49.79
85	10.158.49.80/30	10.158.49.81 – 10.158.49.82	10.158.49.83
86	10.158.49.84/30	10.158.49.85 – 10.158.49.86	10.158.49.87
87	10.158.49.88/30	10.158.49.89 – 10.158.49.90	10.158.49.91
88	10.158.49.92/30	10.158.49.93 – 10.158.49.94	10.158.49.95
89	10.158.49.96/30	10.158.49.97 – 10.158.49.98	10.158.49.99
90	10.158.49.100/30	10.158.49.101 – 10.158.49.102	10.158.49.103
91	10.158.49.104/30	10.158.49.105 – 10.158.49.106	10.158.49.107
92	10.158.49.108/30	10.158.49.109 – 10.158.49.110	10.158.49.111
93	10.158.49.112/30	10.158.49.113 – 10.158.49.114	10.158.49.115
94	10.158.49.116/30	10.158.49.117 – 10.158.49.118	10.158.49.119
95	10.158.49.120/30	10.158.49.121 – 10.158.49.122	10.158.49.123
96	10.158.49.124/30	10.158.49.125 – 10.158.49.126	10.158.49.127
97	10.158.49.128/30	10.158.49.129 – 10.158.49.130	10.158.49.131
98	10.158.49.132/30	10.158.49.133 – 10.158.49.134	10.158.49.135
99	10.158.49.136/30	10.158.49.137 – 10.158.49.138	10.158.49.139
100	10.158.49.140/30	10.158.49.141 – 10.158.49.142	10.158.49.143
101	10.158.49.144/30	10.158.49.145 – 10.158.49.146	10.158.49.147
102	10.158.49.148/30	10.158.49.149 – 10.158.49.150	10.158.49.151
103	10.158.49.152/30	10.158.49.153 – 10.158.49.154	10.158.49.155
104	10.158.49.156/30	10.158.49.157 – 10.158.49.158	10.158.49.159
105	10.158.49.160/30	10.158.49.161 – 10.158.49.162	10.158.49.163
106	10.158.49.164/30	10.158.49.165 – 10.158.49.166	10.158.49.167
107	10.158.49.168/30	10.158.49.169 – 10.158.49.170	10.158.49.171
108	10.158.49.172/30	10.158.49.173 – 10.158.49.174	10.158.49.175
109	10.158.49.176/30	10.158.49.177 – 10.158.49.178	10.158.49.179
110	10.158.49.180/30	10.158.49.181 – 10.158.49.182	10.158.49.183
111	10.158.49.184/30	10.158.49.185 – 10.158.49.186	10.158.49.187
112	10.158.49.188/30	10.158.49.189 – 10.158.49.190	10.158.49.191
113	10.158.49.192/30	10.158.49.193 – 10.158.49.194	10.158.49.195
114	10.158.49.196/30	10.158.49.197 – 10.158.49.198	10.158.49.199
115	10.158.49.200/30	10.158.49.201 – 10.158.49.202	10.158.49.203
116	10.158.49.204/30	10.158.49.205 – 10.158.49.206	10.158.49.207
117	10.158.49.208/30	10.158.49.209 – 10.158.49.210	10.158.49.211
118	10.158.49.212/30	10.158.49.213 – 10.158.49.214	10.158.49.215
119	10.158.49.216/30	10.158.49.217 – 10.158.49.218	10.158.49.219
120	10.158.49.220/30	10.158.49.221 – 10.158.49.222	10.158.49.223
121	10.158.49.224/30	10.158.49.225 – 10.158.49.226	10.158.49.227
122	10.158.49.228/30	10.158.49.229 – 10.158.49.230	10.158.49.231
123	10.158.49.232/30	10.158.49.233 – 10.158.49.234	10.158.49.235
124	10.158.49.236/30	10.158.49.237 – 10.158.49.238	10.158.49.239
125	10.158.49.240/30	10.158.49.241 – 10.158.49.242	10.158.49.243
126	10.158.49.244/30	10.158.49.245 – 10.158.49.246	10.158.49.247
127	10.158.49.248/30	10.158.49.249 – 10.158.49.250	10.158.49.251
128	10.158.49.252/30	10.158.49.253 – 10.158.49.254	10.158.49.255

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 →