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)10.2.192.0/20

network10.2.192.0/20

broadcast10.2.207.255

first host10.2.192.1

last host10.2.207.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.2.192.0/20

address00001010.00000010.11000000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000010.11000000.00000000

broadcast00001010.00000010.11001111.11111111

green = network part, grey = host part

hex0x0a02c000

decimal167952384

reverse dns0.192.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:c000

/20 split into /27 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.192.0/27	10.2.192.1 – 10.2.192.30	10.2.192.31
2	10.2.192.32/27	10.2.192.33 – 10.2.192.62	10.2.192.63
3	10.2.192.64/27	10.2.192.65 – 10.2.192.94	10.2.192.95
4	10.2.192.96/27	10.2.192.97 – 10.2.192.126	10.2.192.127
5	10.2.192.128/27	10.2.192.129 – 10.2.192.158	10.2.192.159
6	10.2.192.160/27	10.2.192.161 – 10.2.192.190	10.2.192.191
7	10.2.192.192/27	10.2.192.193 – 10.2.192.222	10.2.192.223
8	10.2.192.224/27	10.2.192.225 – 10.2.192.254	10.2.192.255
9	10.2.193.0/27	10.2.193.1 – 10.2.193.30	10.2.193.31
10	10.2.193.32/27	10.2.193.33 – 10.2.193.62	10.2.193.63
11	10.2.193.64/27	10.2.193.65 – 10.2.193.94	10.2.193.95
12	10.2.193.96/27	10.2.193.97 – 10.2.193.126	10.2.193.127
13	10.2.193.128/27	10.2.193.129 – 10.2.193.158	10.2.193.159
14	10.2.193.160/27	10.2.193.161 – 10.2.193.190	10.2.193.191
15	10.2.193.192/27	10.2.193.193 – 10.2.193.222	10.2.193.223
16	10.2.193.224/27	10.2.193.225 – 10.2.193.254	10.2.193.255
17	10.2.194.0/27	10.2.194.1 – 10.2.194.30	10.2.194.31
18	10.2.194.32/27	10.2.194.33 – 10.2.194.62	10.2.194.63
19	10.2.194.64/27	10.2.194.65 – 10.2.194.94	10.2.194.95
20	10.2.194.96/27	10.2.194.97 – 10.2.194.126	10.2.194.127
21	10.2.194.128/27	10.2.194.129 – 10.2.194.158	10.2.194.159
22	10.2.194.160/27	10.2.194.161 – 10.2.194.190	10.2.194.191
23	10.2.194.192/27	10.2.194.193 – 10.2.194.222	10.2.194.223
24	10.2.194.224/27	10.2.194.225 – 10.2.194.254	10.2.194.255
25	10.2.195.0/27	10.2.195.1 – 10.2.195.30	10.2.195.31
26	10.2.195.32/27	10.2.195.33 – 10.2.195.62	10.2.195.63
27	10.2.195.64/27	10.2.195.65 – 10.2.195.94	10.2.195.95
28	10.2.195.96/27	10.2.195.97 – 10.2.195.126	10.2.195.127
29	10.2.195.128/27	10.2.195.129 – 10.2.195.158	10.2.195.159
30	10.2.195.160/27	10.2.195.161 – 10.2.195.190	10.2.195.191
31	10.2.195.192/27	10.2.195.193 – 10.2.195.222	10.2.195.223
32	10.2.195.224/27	10.2.195.225 – 10.2.195.254	10.2.195.255
33	10.2.196.0/27	10.2.196.1 – 10.2.196.30	10.2.196.31
34	10.2.196.32/27	10.2.196.33 – 10.2.196.62	10.2.196.63
35	10.2.196.64/27	10.2.196.65 – 10.2.196.94	10.2.196.95
36	10.2.196.96/27	10.2.196.97 – 10.2.196.126	10.2.196.127
37	10.2.196.128/27	10.2.196.129 – 10.2.196.158	10.2.196.159
38	10.2.196.160/27	10.2.196.161 – 10.2.196.190	10.2.196.191
39	10.2.196.192/27	10.2.196.193 – 10.2.196.222	10.2.196.223
40	10.2.196.224/27	10.2.196.225 – 10.2.196.254	10.2.196.255
41	10.2.197.0/27	10.2.197.1 – 10.2.197.30	10.2.197.31
42	10.2.197.32/27	10.2.197.33 – 10.2.197.62	10.2.197.63
43	10.2.197.64/27	10.2.197.65 – 10.2.197.94	10.2.197.95
44	10.2.197.96/27	10.2.197.97 – 10.2.197.126	10.2.197.127
45	10.2.197.128/27	10.2.197.129 – 10.2.197.158	10.2.197.159
46	10.2.197.160/27	10.2.197.161 – 10.2.197.190	10.2.197.191
47	10.2.197.192/27	10.2.197.193 – 10.2.197.222	10.2.197.223
48	10.2.197.224/27	10.2.197.225 – 10.2.197.254	10.2.197.255
49	10.2.198.0/27	10.2.198.1 – 10.2.198.30	10.2.198.31
50	10.2.198.32/27	10.2.198.33 – 10.2.198.62	10.2.198.63
51	10.2.198.64/27	10.2.198.65 – 10.2.198.94	10.2.198.95
52	10.2.198.96/27	10.2.198.97 – 10.2.198.126	10.2.198.127
53	10.2.198.128/27	10.2.198.129 – 10.2.198.158	10.2.198.159
54	10.2.198.160/27	10.2.198.161 – 10.2.198.190	10.2.198.191
55	10.2.198.192/27	10.2.198.193 – 10.2.198.222	10.2.198.223
56	10.2.198.224/27	10.2.198.225 – 10.2.198.254	10.2.198.255
57	10.2.199.0/27	10.2.199.1 – 10.2.199.30	10.2.199.31
58	10.2.199.32/27	10.2.199.33 – 10.2.199.62	10.2.199.63
59	10.2.199.64/27	10.2.199.65 – 10.2.199.94	10.2.199.95
60	10.2.199.96/27	10.2.199.97 – 10.2.199.126	10.2.199.127
61	10.2.199.128/27	10.2.199.129 – 10.2.199.158	10.2.199.159
62	10.2.199.160/27	10.2.199.161 – 10.2.199.190	10.2.199.191
63	10.2.199.192/27	10.2.199.193 – 10.2.199.222	10.2.199.223
64	10.2.199.224/27	10.2.199.225 – 10.2.199.254	10.2.199.255
65	10.2.200.0/27	10.2.200.1 – 10.2.200.30	10.2.200.31
66	10.2.200.32/27	10.2.200.33 – 10.2.200.62	10.2.200.63
67	10.2.200.64/27	10.2.200.65 – 10.2.200.94	10.2.200.95
68	10.2.200.96/27	10.2.200.97 – 10.2.200.126	10.2.200.127
69	10.2.200.128/27	10.2.200.129 – 10.2.200.158	10.2.200.159
70	10.2.200.160/27	10.2.200.161 – 10.2.200.190	10.2.200.191
71	10.2.200.192/27	10.2.200.193 – 10.2.200.222	10.2.200.223
72	10.2.200.224/27	10.2.200.225 – 10.2.200.254	10.2.200.255
73	10.2.201.0/27	10.2.201.1 – 10.2.201.30	10.2.201.31
74	10.2.201.32/27	10.2.201.33 – 10.2.201.62	10.2.201.63
75	10.2.201.64/27	10.2.201.65 – 10.2.201.94	10.2.201.95
76	10.2.201.96/27	10.2.201.97 – 10.2.201.126	10.2.201.127
77	10.2.201.128/27	10.2.201.129 – 10.2.201.158	10.2.201.159
78	10.2.201.160/27	10.2.201.161 – 10.2.201.190	10.2.201.191
79	10.2.201.192/27	10.2.201.193 – 10.2.201.222	10.2.201.223
80	10.2.201.224/27	10.2.201.225 – 10.2.201.254	10.2.201.255
81	10.2.202.0/27	10.2.202.1 – 10.2.202.30	10.2.202.31
82	10.2.202.32/27	10.2.202.33 – 10.2.202.62	10.2.202.63
83	10.2.202.64/27	10.2.202.65 – 10.2.202.94	10.2.202.95
84	10.2.202.96/27	10.2.202.97 – 10.2.202.126	10.2.202.127
85	10.2.202.128/27	10.2.202.129 – 10.2.202.158	10.2.202.159
86	10.2.202.160/27	10.2.202.161 – 10.2.202.190	10.2.202.191
87	10.2.202.192/27	10.2.202.193 – 10.2.202.222	10.2.202.223
88	10.2.202.224/27	10.2.202.225 – 10.2.202.254	10.2.202.255
89	10.2.203.0/27	10.2.203.1 – 10.2.203.30	10.2.203.31
90	10.2.203.32/27	10.2.203.33 – 10.2.203.62	10.2.203.63
91	10.2.203.64/27	10.2.203.65 – 10.2.203.94	10.2.203.95
92	10.2.203.96/27	10.2.203.97 – 10.2.203.126	10.2.203.127
93	10.2.203.128/27	10.2.203.129 – 10.2.203.158	10.2.203.159
94	10.2.203.160/27	10.2.203.161 – 10.2.203.190	10.2.203.191
95	10.2.203.192/27	10.2.203.193 – 10.2.203.222	10.2.203.223
96	10.2.203.224/27	10.2.203.225 – 10.2.203.254	10.2.203.255
97	10.2.204.0/27	10.2.204.1 – 10.2.204.30	10.2.204.31
98	10.2.204.32/27	10.2.204.33 – 10.2.204.62	10.2.204.63
99	10.2.204.64/27	10.2.204.65 – 10.2.204.94	10.2.204.95
100	10.2.204.96/27	10.2.204.97 – 10.2.204.126	10.2.204.127
101	10.2.204.128/27	10.2.204.129 – 10.2.204.158	10.2.204.159
102	10.2.204.160/27	10.2.204.161 – 10.2.204.190	10.2.204.191
103	10.2.204.192/27	10.2.204.193 – 10.2.204.222	10.2.204.223
104	10.2.204.224/27	10.2.204.225 – 10.2.204.254	10.2.204.255
105	10.2.205.0/27	10.2.205.1 – 10.2.205.30	10.2.205.31
106	10.2.205.32/27	10.2.205.33 – 10.2.205.62	10.2.205.63
107	10.2.205.64/27	10.2.205.65 – 10.2.205.94	10.2.205.95
108	10.2.205.96/27	10.2.205.97 – 10.2.205.126	10.2.205.127
109	10.2.205.128/27	10.2.205.129 – 10.2.205.158	10.2.205.159
110	10.2.205.160/27	10.2.205.161 – 10.2.205.190	10.2.205.191
111	10.2.205.192/27	10.2.205.193 – 10.2.205.222	10.2.205.223
112	10.2.205.224/27	10.2.205.225 – 10.2.205.254	10.2.205.255
113	10.2.206.0/27	10.2.206.1 – 10.2.206.30	10.2.206.31
114	10.2.206.32/27	10.2.206.33 – 10.2.206.62	10.2.206.63
115	10.2.206.64/27	10.2.206.65 – 10.2.206.94	10.2.206.95
116	10.2.206.96/27	10.2.206.97 – 10.2.206.126	10.2.206.127
117	10.2.206.128/27	10.2.206.129 – 10.2.206.158	10.2.206.159
118	10.2.206.160/27	10.2.206.161 – 10.2.206.190	10.2.206.191
119	10.2.206.192/27	10.2.206.193 – 10.2.206.222	10.2.206.223
120	10.2.206.224/27	10.2.206.225 – 10.2.206.254	10.2.206.255
121	10.2.207.0/27	10.2.207.1 – 10.2.207.30	10.2.207.31
122	10.2.207.32/27	10.2.207.33 – 10.2.207.62	10.2.207.63
123	10.2.207.64/27	10.2.207.65 – 10.2.207.94	10.2.207.95
124	10.2.207.96/27	10.2.207.97 – 10.2.207.126	10.2.207.127
125	10.2.207.128/27	10.2.207.129 – 10.2.207.158	10.2.207.159
126	10.2.207.160/27	10.2.207.161 – 10.2.207.190	10.2.207.191
127	10.2.207.192/27	10.2.207.193 – 10.2.207.222	10.2.207.223
128	10.2.207.224/27	10.2.207.225 – 10.2.207.254	10.2.207.255

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