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)10.158.0.0/19

network10.158.0.0/19

broadcast10.158.31.255

first host10.158.0.1

last host10.158.31.254

subnet mask255.255.224.0

wildcard0.0.31.255

addresses8,192

usable hosts8,190

classA

ipcalc 10.158.0.0/19

address00001010.10011110.00000000.00000000

subnet mask11111111.11111111.11100000.00000000

network00001010.10011110.00000000.00000000

broadcast00001010.10011110.00011111.11111111

green = network part, grey = host part

hex0x0a9e0000

decimal178126848

reverse dns0.0.158.10.in-addr.arpa

ipv4-mapped::ffff:a9e:0

/19 split into /26 · 128 subnets

close ×

#	network	host range	broadcast
1	10.158.0.0/26	10.158.0.1 – 10.158.0.62	10.158.0.63
2	10.158.0.64/26	10.158.0.65 – 10.158.0.126	10.158.0.127
3	10.158.0.128/26	10.158.0.129 – 10.158.0.190	10.158.0.191
4	10.158.0.192/26	10.158.0.193 – 10.158.0.254	10.158.0.255
5	10.158.1.0/26	10.158.1.1 – 10.158.1.62	10.158.1.63
6	10.158.1.64/26	10.158.1.65 – 10.158.1.126	10.158.1.127
7	10.158.1.128/26	10.158.1.129 – 10.158.1.190	10.158.1.191
8	10.158.1.192/26	10.158.1.193 – 10.158.1.254	10.158.1.255
9	10.158.2.0/26	10.158.2.1 – 10.158.2.62	10.158.2.63
10	10.158.2.64/26	10.158.2.65 – 10.158.2.126	10.158.2.127
11	10.158.2.128/26	10.158.2.129 – 10.158.2.190	10.158.2.191
12	10.158.2.192/26	10.158.2.193 – 10.158.2.254	10.158.2.255
13	10.158.3.0/26	10.158.3.1 – 10.158.3.62	10.158.3.63
14	10.158.3.64/26	10.158.3.65 – 10.158.3.126	10.158.3.127
15	10.158.3.128/26	10.158.3.129 – 10.158.3.190	10.158.3.191
16	10.158.3.192/26	10.158.3.193 – 10.158.3.254	10.158.3.255
17	10.158.4.0/26	10.158.4.1 – 10.158.4.62	10.158.4.63
18	10.158.4.64/26	10.158.4.65 – 10.158.4.126	10.158.4.127
19	10.158.4.128/26	10.158.4.129 – 10.158.4.190	10.158.4.191
20	10.158.4.192/26	10.158.4.193 – 10.158.4.254	10.158.4.255
21	10.158.5.0/26	10.158.5.1 – 10.158.5.62	10.158.5.63
22	10.158.5.64/26	10.158.5.65 – 10.158.5.126	10.158.5.127
23	10.158.5.128/26	10.158.5.129 – 10.158.5.190	10.158.5.191
24	10.158.5.192/26	10.158.5.193 – 10.158.5.254	10.158.5.255
25	10.158.6.0/26	10.158.6.1 – 10.158.6.62	10.158.6.63
26	10.158.6.64/26	10.158.6.65 – 10.158.6.126	10.158.6.127
27	10.158.6.128/26	10.158.6.129 – 10.158.6.190	10.158.6.191
28	10.158.6.192/26	10.158.6.193 – 10.158.6.254	10.158.6.255
29	10.158.7.0/26	10.158.7.1 – 10.158.7.62	10.158.7.63
30	10.158.7.64/26	10.158.7.65 – 10.158.7.126	10.158.7.127
31	10.158.7.128/26	10.158.7.129 – 10.158.7.190	10.158.7.191
32	10.158.7.192/26	10.158.7.193 – 10.158.7.254	10.158.7.255
33	10.158.8.0/26	10.158.8.1 – 10.158.8.62	10.158.8.63
34	10.158.8.64/26	10.158.8.65 – 10.158.8.126	10.158.8.127
35	10.158.8.128/26	10.158.8.129 – 10.158.8.190	10.158.8.191
36	10.158.8.192/26	10.158.8.193 – 10.158.8.254	10.158.8.255
37	10.158.9.0/26	10.158.9.1 – 10.158.9.62	10.158.9.63
38	10.158.9.64/26	10.158.9.65 – 10.158.9.126	10.158.9.127
39	10.158.9.128/26	10.158.9.129 – 10.158.9.190	10.158.9.191
40	10.158.9.192/26	10.158.9.193 – 10.158.9.254	10.158.9.255
41	10.158.10.0/26	10.158.10.1 – 10.158.10.62	10.158.10.63
42	10.158.10.64/26	10.158.10.65 – 10.158.10.126	10.158.10.127
43	10.158.10.128/26	10.158.10.129 – 10.158.10.190	10.158.10.191
44	10.158.10.192/26	10.158.10.193 – 10.158.10.254	10.158.10.255
45	10.158.11.0/26	10.158.11.1 – 10.158.11.62	10.158.11.63
46	10.158.11.64/26	10.158.11.65 – 10.158.11.126	10.158.11.127
47	10.158.11.128/26	10.158.11.129 – 10.158.11.190	10.158.11.191
48	10.158.11.192/26	10.158.11.193 – 10.158.11.254	10.158.11.255
49	10.158.12.0/26	10.158.12.1 – 10.158.12.62	10.158.12.63
50	10.158.12.64/26	10.158.12.65 – 10.158.12.126	10.158.12.127
51	10.158.12.128/26	10.158.12.129 – 10.158.12.190	10.158.12.191
52	10.158.12.192/26	10.158.12.193 – 10.158.12.254	10.158.12.255
53	10.158.13.0/26	10.158.13.1 – 10.158.13.62	10.158.13.63
54	10.158.13.64/26	10.158.13.65 – 10.158.13.126	10.158.13.127
55	10.158.13.128/26	10.158.13.129 – 10.158.13.190	10.158.13.191
56	10.158.13.192/26	10.158.13.193 – 10.158.13.254	10.158.13.255
57	10.158.14.0/26	10.158.14.1 – 10.158.14.62	10.158.14.63
58	10.158.14.64/26	10.158.14.65 – 10.158.14.126	10.158.14.127
59	10.158.14.128/26	10.158.14.129 – 10.158.14.190	10.158.14.191
60	10.158.14.192/26	10.158.14.193 – 10.158.14.254	10.158.14.255
61	10.158.15.0/26	10.158.15.1 – 10.158.15.62	10.158.15.63
62	10.158.15.64/26	10.158.15.65 – 10.158.15.126	10.158.15.127
63	10.158.15.128/26	10.158.15.129 – 10.158.15.190	10.158.15.191
64	10.158.15.192/26	10.158.15.193 – 10.158.15.254	10.158.15.255
65	10.158.16.0/26	10.158.16.1 – 10.158.16.62	10.158.16.63
66	10.158.16.64/26	10.158.16.65 – 10.158.16.126	10.158.16.127
67	10.158.16.128/26	10.158.16.129 – 10.158.16.190	10.158.16.191
68	10.158.16.192/26	10.158.16.193 – 10.158.16.254	10.158.16.255
69	10.158.17.0/26	10.158.17.1 – 10.158.17.62	10.158.17.63
70	10.158.17.64/26	10.158.17.65 – 10.158.17.126	10.158.17.127
71	10.158.17.128/26	10.158.17.129 – 10.158.17.190	10.158.17.191
72	10.158.17.192/26	10.158.17.193 – 10.158.17.254	10.158.17.255
73	10.158.18.0/26	10.158.18.1 – 10.158.18.62	10.158.18.63
74	10.158.18.64/26	10.158.18.65 – 10.158.18.126	10.158.18.127
75	10.158.18.128/26	10.158.18.129 – 10.158.18.190	10.158.18.191
76	10.158.18.192/26	10.158.18.193 – 10.158.18.254	10.158.18.255
77	10.158.19.0/26	10.158.19.1 – 10.158.19.62	10.158.19.63
78	10.158.19.64/26	10.158.19.65 – 10.158.19.126	10.158.19.127
79	10.158.19.128/26	10.158.19.129 – 10.158.19.190	10.158.19.191
80	10.158.19.192/26	10.158.19.193 – 10.158.19.254	10.158.19.255
81	10.158.20.0/26	10.158.20.1 – 10.158.20.62	10.158.20.63
82	10.158.20.64/26	10.158.20.65 – 10.158.20.126	10.158.20.127
83	10.158.20.128/26	10.158.20.129 – 10.158.20.190	10.158.20.191
84	10.158.20.192/26	10.158.20.193 – 10.158.20.254	10.158.20.255
85	10.158.21.0/26	10.158.21.1 – 10.158.21.62	10.158.21.63
86	10.158.21.64/26	10.158.21.65 – 10.158.21.126	10.158.21.127
87	10.158.21.128/26	10.158.21.129 – 10.158.21.190	10.158.21.191
88	10.158.21.192/26	10.158.21.193 – 10.158.21.254	10.158.21.255
89	10.158.22.0/26	10.158.22.1 – 10.158.22.62	10.158.22.63
90	10.158.22.64/26	10.158.22.65 – 10.158.22.126	10.158.22.127
91	10.158.22.128/26	10.158.22.129 – 10.158.22.190	10.158.22.191
92	10.158.22.192/26	10.158.22.193 – 10.158.22.254	10.158.22.255
93	10.158.23.0/26	10.158.23.1 – 10.158.23.62	10.158.23.63
94	10.158.23.64/26	10.158.23.65 – 10.158.23.126	10.158.23.127
95	10.158.23.128/26	10.158.23.129 – 10.158.23.190	10.158.23.191
96	10.158.23.192/26	10.158.23.193 – 10.158.23.254	10.158.23.255
97	10.158.24.0/26	10.158.24.1 – 10.158.24.62	10.158.24.63
98	10.158.24.64/26	10.158.24.65 – 10.158.24.126	10.158.24.127
99	10.158.24.128/26	10.158.24.129 – 10.158.24.190	10.158.24.191
100	10.158.24.192/26	10.158.24.193 – 10.158.24.254	10.158.24.255
101	10.158.25.0/26	10.158.25.1 – 10.158.25.62	10.158.25.63
102	10.158.25.64/26	10.158.25.65 – 10.158.25.126	10.158.25.127
103	10.158.25.128/26	10.158.25.129 – 10.158.25.190	10.158.25.191
104	10.158.25.192/26	10.158.25.193 – 10.158.25.254	10.158.25.255
105	10.158.26.0/26	10.158.26.1 – 10.158.26.62	10.158.26.63
106	10.158.26.64/26	10.158.26.65 – 10.158.26.126	10.158.26.127
107	10.158.26.128/26	10.158.26.129 – 10.158.26.190	10.158.26.191
108	10.158.26.192/26	10.158.26.193 – 10.158.26.254	10.158.26.255
109	10.158.27.0/26	10.158.27.1 – 10.158.27.62	10.158.27.63
110	10.158.27.64/26	10.158.27.65 – 10.158.27.126	10.158.27.127
111	10.158.27.128/26	10.158.27.129 – 10.158.27.190	10.158.27.191
112	10.158.27.192/26	10.158.27.193 – 10.158.27.254	10.158.27.255
113	10.158.28.0/26	10.158.28.1 – 10.158.28.62	10.158.28.63
114	10.158.28.64/26	10.158.28.65 – 10.158.28.126	10.158.28.127
115	10.158.28.128/26	10.158.28.129 – 10.158.28.190	10.158.28.191
116	10.158.28.192/26	10.158.28.193 – 10.158.28.254	10.158.28.255
117	10.158.29.0/26	10.158.29.1 – 10.158.29.62	10.158.29.63
118	10.158.29.64/26	10.158.29.65 – 10.158.29.126	10.158.29.127
119	10.158.29.128/26	10.158.29.129 – 10.158.29.190	10.158.29.191
120	10.158.29.192/26	10.158.29.193 – 10.158.29.254	10.158.29.255
121	10.158.30.0/26	10.158.30.1 – 10.158.30.62	10.158.30.63
122	10.158.30.64/26	10.158.30.65 – 10.158.30.126	10.158.30.127
123	10.158.30.128/26	10.158.30.129 – 10.158.30.190	10.158.30.191
124	10.158.30.192/26	10.158.30.193 – 10.158.30.254	10.158.30.255
125	10.158.31.0/26	10.158.31.1 – 10.158.31.62	10.158.31.63
126	10.158.31.64/26	10.158.31.65 – 10.158.31.126	10.158.31.127
127	10.158.31.128/26	10.158.31.129 – 10.158.31.190	10.158.31.191
128	10.158.31.192/26	10.158.31.193 – 10.158.31.254	10.158.31.255

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 /19
/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	1
/20	255.255.240.0	4,096	4,094	2 split →
/21	255.255.248.0	2,048	2,046	4 split →
/22	255.255.252.0	1,024	1,022	8 split →
/23	255.255.254.0	512	510	16 split →
/24	255.255.255.0	256	254	32 split →
/25	255.255.255.128	128	126	64 split →
/26	255.255.255.192	64	62	128 split →
/27	255.255.255.224	32	30	256 split →
/28	255.255.255.240	16	14	512 split →
/29	255.255.255.248	8	6	1,024 split →
/30	255.255.255.252	4	2	2,048 split →
/31	255.255.255.254	2	2	4,096 split →
/32	255.255.255.255	1	1	8,192 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 →