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)10.3.48.0/20

network10.3.48.0/20

broadcast10.3.63.255

first host10.3.48.1

last host10.3.63.254

subnet mask255.255.240.0

wildcard0.0.15.255

addresses4,096

usable hosts4,094

classA

ipcalc 10.3.48.0/20

address00001010.00000011.00110000.00000000

subnet mask11111111.11111111.11110000.00000000

network00001010.00000011.00110000.00000000

broadcast00001010.00000011.00111111.11111111

green = network part, grey = host part

hex0x0a033000

decimal167981056

reverse dns0.48.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:3000

/20 split into /27 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.48.0/27	10.3.48.1 – 10.3.48.30	10.3.48.31
2	10.3.48.32/27	10.3.48.33 – 10.3.48.62	10.3.48.63
3	10.3.48.64/27	10.3.48.65 – 10.3.48.94	10.3.48.95
4	10.3.48.96/27	10.3.48.97 – 10.3.48.126	10.3.48.127
5	10.3.48.128/27	10.3.48.129 – 10.3.48.158	10.3.48.159
6	10.3.48.160/27	10.3.48.161 – 10.3.48.190	10.3.48.191
7	10.3.48.192/27	10.3.48.193 – 10.3.48.222	10.3.48.223
8	10.3.48.224/27	10.3.48.225 – 10.3.48.254	10.3.48.255
9	10.3.49.0/27	10.3.49.1 – 10.3.49.30	10.3.49.31
10	10.3.49.32/27	10.3.49.33 – 10.3.49.62	10.3.49.63
11	10.3.49.64/27	10.3.49.65 – 10.3.49.94	10.3.49.95
12	10.3.49.96/27	10.3.49.97 – 10.3.49.126	10.3.49.127
13	10.3.49.128/27	10.3.49.129 – 10.3.49.158	10.3.49.159
14	10.3.49.160/27	10.3.49.161 – 10.3.49.190	10.3.49.191
15	10.3.49.192/27	10.3.49.193 – 10.3.49.222	10.3.49.223
16	10.3.49.224/27	10.3.49.225 – 10.3.49.254	10.3.49.255
17	10.3.50.0/27	10.3.50.1 – 10.3.50.30	10.3.50.31
18	10.3.50.32/27	10.3.50.33 – 10.3.50.62	10.3.50.63
19	10.3.50.64/27	10.3.50.65 – 10.3.50.94	10.3.50.95
20	10.3.50.96/27	10.3.50.97 – 10.3.50.126	10.3.50.127
21	10.3.50.128/27	10.3.50.129 – 10.3.50.158	10.3.50.159
22	10.3.50.160/27	10.3.50.161 – 10.3.50.190	10.3.50.191
23	10.3.50.192/27	10.3.50.193 – 10.3.50.222	10.3.50.223
24	10.3.50.224/27	10.3.50.225 – 10.3.50.254	10.3.50.255
25	10.3.51.0/27	10.3.51.1 – 10.3.51.30	10.3.51.31
26	10.3.51.32/27	10.3.51.33 – 10.3.51.62	10.3.51.63
27	10.3.51.64/27	10.3.51.65 – 10.3.51.94	10.3.51.95
28	10.3.51.96/27	10.3.51.97 – 10.3.51.126	10.3.51.127
29	10.3.51.128/27	10.3.51.129 – 10.3.51.158	10.3.51.159
30	10.3.51.160/27	10.3.51.161 – 10.3.51.190	10.3.51.191
31	10.3.51.192/27	10.3.51.193 – 10.3.51.222	10.3.51.223
32	10.3.51.224/27	10.3.51.225 – 10.3.51.254	10.3.51.255
33	10.3.52.0/27	10.3.52.1 – 10.3.52.30	10.3.52.31
34	10.3.52.32/27	10.3.52.33 – 10.3.52.62	10.3.52.63
35	10.3.52.64/27	10.3.52.65 – 10.3.52.94	10.3.52.95
36	10.3.52.96/27	10.3.52.97 – 10.3.52.126	10.3.52.127
37	10.3.52.128/27	10.3.52.129 – 10.3.52.158	10.3.52.159
38	10.3.52.160/27	10.3.52.161 – 10.3.52.190	10.3.52.191
39	10.3.52.192/27	10.3.52.193 – 10.3.52.222	10.3.52.223
40	10.3.52.224/27	10.3.52.225 – 10.3.52.254	10.3.52.255
41	10.3.53.0/27	10.3.53.1 – 10.3.53.30	10.3.53.31
42	10.3.53.32/27	10.3.53.33 – 10.3.53.62	10.3.53.63
43	10.3.53.64/27	10.3.53.65 – 10.3.53.94	10.3.53.95
44	10.3.53.96/27	10.3.53.97 – 10.3.53.126	10.3.53.127
45	10.3.53.128/27	10.3.53.129 – 10.3.53.158	10.3.53.159
46	10.3.53.160/27	10.3.53.161 – 10.3.53.190	10.3.53.191
47	10.3.53.192/27	10.3.53.193 – 10.3.53.222	10.3.53.223
48	10.3.53.224/27	10.3.53.225 – 10.3.53.254	10.3.53.255
49	10.3.54.0/27	10.3.54.1 – 10.3.54.30	10.3.54.31
50	10.3.54.32/27	10.3.54.33 – 10.3.54.62	10.3.54.63
51	10.3.54.64/27	10.3.54.65 – 10.3.54.94	10.3.54.95
52	10.3.54.96/27	10.3.54.97 – 10.3.54.126	10.3.54.127
53	10.3.54.128/27	10.3.54.129 – 10.3.54.158	10.3.54.159
54	10.3.54.160/27	10.3.54.161 – 10.3.54.190	10.3.54.191
55	10.3.54.192/27	10.3.54.193 – 10.3.54.222	10.3.54.223
56	10.3.54.224/27	10.3.54.225 – 10.3.54.254	10.3.54.255
57	10.3.55.0/27	10.3.55.1 – 10.3.55.30	10.3.55.31
58	10.3.55.32/27	10.3.55.33 – 10.3.55.62	10.3.55.63
59	10.3.55.64/27	10.3.55.65 – 10.3.55.94	10.3.55.95
60	10.3.55.96/27	10.3.55.97 – 10.3.55.126	10.3.55.127
61	10.3.55.128/27	10.3.55.129 – 10.3.55.158	10.3.55.159
62	10.3.55.160/27	10.3.55.161 – 10.3.55.190	10.3.55.191
63	10.3.55.192/27	10.3.55.193 – 10.3.55.222	10.3.55.223
64	10.3.55.224/27	10.3.55.225 – 10.3.55.254	10.3.55.255
65	10.3.56.0/27	10.3.56.1 – 10.3.56.30	10.3.56.31
66	10.3.56.32/27	10.3.56.33 – 10.3.56.62	10.3.56.63
67	10.3.56.64/27	10.3.56.65 – 10.3.56.94	10.3.56.95
68	10.3.56.96/27	10.3.56.97 – 10.3.56.126	10.3.56.127
69	10.3.56.128/27	10.3.56.129 – 10.3.56.158	10.3.56.159
70	10.3.56.160/27	10.3.56.161 – 10.3.56.190	10.3.56.191
71	10.3.56.192/27	10.3.56.193 – 10.3.56.222	10.3.56.223
72	10.3.56.224/27	10.3.56.225 – 10.3.56.254	10.3.56.255
73	10.3.57.0/27	10.3.57.1 – 10.3.57.30	10.3.57.31
74	10.3.57.32/27	10.3.57.33 – 10.3.57.62	10.3.57.63
75	10.3.57.64/27	10.3.57.65 – 10.3.57.94	10.3.57.95
76	10.3.57.96/27	10.3.57.97 – 10.3.57.126	10.3.57.127
77	10.3.57.128/27	10.3.57.129 – 10.3.57.158	10.3.57.159
78	10.3.57.160/27	10.3.57.161 – 10.3.57.190	10.3.57.191
79	10.3.57.192/27	10.3.57.193 – 10.3.57.222	10.3.57.223
80	10.3.57.224/27	10.3.57.225 – 10.3.57.254	10.3.57.255
81	10.3.58.0/27	10.3.58.1 – 10.3.58.30	10.3.58.31
82	10.3.58.32/27	10.3.58.33 – 10.3.58.62	10.3.58.63
83	10.3.58.64/27	10.3.58.65 – 10.3.58.94	10.3.58.95
84	10.3.58.96/27	10.3.58.97 – 10.3.58.126	10.3.58.127
85	10.3.58.128/27	10.3.58.129 – 10.3.58.158	10.3.58.159
86	10.3.58.160/27	10.3.58.161 – 10.3.58.190	10.3.58.191
87	10.3.58.192/27	10.3.58.193 – 10.3.58.222	10.3.58.223
88	10.3.58.224/27	10.3.58.225 – 10.3.58.254	10.3.58.255
89	10.3.59.0/27	10.3.59.1 – 10.3.59.30	10.3.59.31
90	10.3.59.32/27	10.3.59.33 – 10.3.59.62	10.3.59.63
91	10.3.59.64/27	10.3.59.65 – 10.3.59.94	10.3.59.95
92	10.3.59.96/27	10.3.59.97 – 10.3.59.126	10.3.59.127
93	10.3.59.128/27	10.3.59.129 – 10.3.59.158	10.3.59.159
94	10.3.59.160/27	10.3.59.161 – 10.3.59.190	10.3.59.191
95	10.3.59.192/27	10.3.59.193 – 10.3.59.222	10.3.59.223
96	10.3.59.224/27	10.3.59.225 – 10.3.59.254	10.3.59.255
97	10.3.60.0/27	10.3.60.1 – 10.3.60.30	10.3.60.31
98	10.3.60.32/27	10.3.60.33 – 10.3.60.62	10.3.60.63
99	10.3.60.64/27	10.3.60.65 – 10.3.60.94	10.3.60.95
100	10.3.60.96/27	10.3.60.97 – 10.3.60.126	10.3.60.127
101	10.3.60.128/27	10.3.60.129 – 10.3.60.158	10.3.60.159
102	10.3.60.160/27	10.3.60.161 – 10.3.60.190	10.3.60.191
103	10.3.60.192/27	10.3.60.193 – 10.3.60.222	10.3.60.223
104	10.3.60.224/27	10.3.60.225 – 10.3.60.254	10.3.60.255
105	10.3.61.0/27	10.3.61.1 – 10.3.61.30	10.3.61.31
106	10.3.61.32/27	10.3.61.33 – 10.3.61.62	10.3.61.63
107	10.3.61.64/27	10.3.61.65 – 10.3.61.94	10.3.61.95
108	10.3.61.96/27	10.3.61.97 – 10.3.61.126	10.3.61.127
109	10.3.61.128/27	10.3.61.129 – 10.3.61.158	10.3.61.159
110	10.3.61.160/27	10.3.61.161 – 10.3.61.190	10.3.61.191
111	10.3.61.192/27	10.3.61.193 – 10.3.61.222	10.3.61.223
112	10.3.61.224/27	10.3.61.225 – 10.3.61.254	10.3.61.255
113	10.3.62.0/27	10.3.62.1 – 10.3.62.30	10.3.62.31
114	10.3.62.32/27	10.3.62.33 – 10.3.62.62	10.3.62.63
115	10.3.62.64/27	10.3.62.65 – 10.3.62.94	10.3.62.95
116	10.3.62.96/27	10.3.62.97 – 10.3.62.126	10.3.62.127
117	10.3.62.128/27	10.3.62.129 – 10.3.62.158	10.3.62.159
118	10.3.62.160/27	10.3.62.161 – 10.3.62.190	10.3.62.191
119	10.3.62.192/27	10.3.62.193 – 10.3.62.222	10.3.62.223
120	10.3.62.224/27	10.3.62.225 – 10.3.62.254	10.3.62.255
121	10.3.63.0/27	10.3.63.1 – 10.3.63.30	10.3.63.31
122	10.3.63.32/27	10.3.63.33 – 10.3.63.62	10.3.63.63
123	10.3.63.64/27	10.3.63.65 – 10.3.63.94	10.3.63.95
124	10.3.63.96/27	10.3.63.97 – 10.3.63.126	10.3.63.127
125	10.3.63.128/27	10.3.63.129 – 10.3.63.158	10.3.63.159
126	10.3.63.160/27	10.3.63.161 – 10.3.63.190	10.3.63.191
127	10.3.63.192/27	10.3.63.193 – 10.3.63.222	10.3.63.223
128	10.3.63.224/27	10.3.63.225 – 10.3.63.254	10.3.63.255

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 →