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)172.16.3.0/25

network172.16.3.0/25

broadcast172.16.3.127

first host172.16.3.1

last host172.16.3.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classB

ipcalc 172.16.3.0/25

address10101100.00010000.00000011.00000000

subnet mask11111111.11111111.11111111.10000000

network10101100.00010000.00000011.00000000

broadcast10101100.00010000.00000011.01111111

green = network part, grey = host part

hex0xac100300

decimal2886730496

reverse dns0.3.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:300

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	172.16.3.0/32	172.16.3.0 – 172.16.3.0	172.16.3.0
2	172.16.3.1/32	172.16.3.1 – 172.16.3.1	172.16.3.1
3	172.16.3.2/32	172.16.3.2 – 172.16.3.2	172.16.3.2
4	172.16.3.3/32	172.16.3.3 – 172.16.3.3	172.16.3.3
5	172.16.3.4/32	172.16.3.4 – 172.16.3.4	172.16.3.4
6	172.16.3.5/32	172.16.3.5 – 172.16.3.5	172.16.3.5
7	172.16.3.6/32	172.16.3.6 – 172.16.3.6	172.16.3.6
8	172.16.3.7/32	172.16.3.7 – 172.16.3.7	172.16.3.7
9	172.16.3.8/32	172.16.3.8 – 172.16.3.8	172.16.3.8
10	172.16.3.9/32	172.16.3.9 – 172.16.3.9	172.16.3.9
11	172.16.3.10/32	172.16.3.10 – 172.16.3.10	172.16.3.10
12	172.16.3.11/32	172.16.3.11 – 172.16.3.11	172.16.3.11
13	172.16.3.12/32	172.16.3.12 – 172.16.3.12	172.16.3.12
14	172.16.3.13/32	172.16.3.13 – 172.16.3.13	172.16.3.13
15	172.16.3.14/32	172.16.3.14 – 172.16.3.14	172.16.3.14
16	172.16.3.15/32	172.16.3.15 – 172.16.3.15	172.16.3.15
17	172.16.3.16/32	172.16.3.16 – 172.16.3.16	172.16.3.16
18	172.16.3.17/32	172.16.3.17 – 172.16.3.17	172.16.3.17
19	172.16.3.18/32	172.16.3.18 – 172.16.3.18	172.16.3.18
20	172.16.3.19/32	172.16.3.19 – 172.16.3.19	172.16.3.19
21	172.16.3.20/32	172.16.3.20 – 172.16.3.20	172.16.3.20
22	172.16.3.21/32	172.16.3.21 – 172.16.3.21	172.16.3.21
23	172.16.3.22/32	172.16.3.22 – 172.16.3.22	172.16.3.22
24	172.16.3.23/32	172.16.3.23 – 172.16.3.23	172.16.3.23
25	172.16.3.24/32	172.16.3.24 – 172.16.3.24	172.16.3.24
26	172.16.3.25/32	172.16.3.25 – 172.16.3.25	172.16.3.25
27	172.16.3.26/32	172.16.3.26 – 172.16.3.26	172.16.3.26
28	172.16.3.27/32	172.16.3.27 – 172.16.3.27	172.16.3.27
29	172.16.3.28/32	172.16.3.28 – 172.16.3.28	172.16.3.28
30	172.16.3.29/32	172.16.3.29 – 172.16.3.29	172.16.3.29
31	172.16.3.30/32	172.16.3.30 – 172.16.3.30	172.16.3.30
32	172.16.3.31/32	172.16.3.31 – 172.16.3.31	172.16.3.31
33	172.16.3.32/32	172.16.3.32 – 172.16.3.32	172.16.3.32
34	172.16.3.33/32	172.16.3.33 – 172.16.3.33	172.16.3.33
35	172.16.3.34/32	172.16.3.34 – 172.16.3.34	172.16.3.34
36	172.16.3.35/32	172.16.3.35 – 172.16.3.35	172.16.3.35
37	172.16.3.36/32	172.16.3.36 – 172.16.3.36	172.16.3.36
38	172.16.3.37/32	172.16.3.37 – 172.16.3.37	172.16.3.37
39	172.16.3.38/32	172.16.3.38 – 172.16.3.38	172.16.3.38
40	172.16.3.39/32	172.16.3.39 – 172.16.3.39	172.16.3.39
41	172.16.3.40/32	172.16.3.40 – 172.16.3.40	172.16.3.40
42	172.16.3.41/32	172.16.3.41 – 172.16.3.41	172.16.3.41
43	172.16.3.42/32	172.16.3.42 – 172.16.3.42	172.16.3.42
44	172.16.3.43/32	172.16.3.43 – 172.16.3.43	172.16.3.43
45	172.16.3.44/32	172.16.3.44 – 172.16.3.44	172.16.3.44
46	172.16.3.45/32	172.16.3.45 – 172.16.3.45	172.16.3.45
47	172.16.3.46/32	172.16.3.46 – 172.16.3.46	172.16.3.46
48	172.16.3.47/32	172.16.3.47 – 172.16.3.47	172.16.3.47
49	172.16.3.48/32	172.16.3.48 – 172.16.3.48	172.16.3.48
50	172.16.3.49/32	172.16.3.49 – 172.16.3.49	172.16.3.49
51	172.16.3.50/32	172.16.3.50 – 172.16.3.50	172.16.3.50
52	172.16.3.51/32	172.16.3.51 – 172.16.3.51	172.16.3.51
53	172.16.3.52/32	172.16.3.52 – 172.16.3.52	172.16.3.52
54	172.16.3.53/32	172.16.3.53 – 172.16.3.53	172.16.3.53
55	172.16.3.54/32	172.16.3.54 – 172.16.3.54	172.16.3.54
56	172.16.3.55/32	172.16.3.55 – 172.16.3.55	172.16.3.55
57	172.16.3.56/32	172.16.3.56 – 172.16.3.56	172.16.3.56
58	172.16.3.57/32	172.16.3.57 – 172.16.3.57	172.16.3.57
59	172.16.3.58/32	172.16.3.58 – 172.16.3.58	172.16.3.58
60	172.16.3.59/32	172.16.3.59 – 172.16.3.59	172.16.3.59
61	172.16.3.60/32	172.16.3.60 – 172.16.3.60	172.16.3.60
62	172.16.3.61/32	172.16.3.61 – 172.16.3.61	172.16.3.61
63	172.16.3.62/32	172.16.3.62 – 172.16.3.62	172.16.3.62
64	172.16.3.63/32	172.16.3.63 – 172.16.3.63	172.16.3.63
65	172.16.3.64/32	172.16.3.64 – 172.16.3.64	172.16.3.64
66	172.16.3.65/32	172.16.3.65 – 172.16.3.65	172.16.3.65
67	172.16.3.66/32	172.16.3.66 – 172.16.3.66	172.16.3.66
68	172.16.3.67/32	172.16.3.67 – 172.16.3.67	172.16.3.67
69	172.16.3.68/32	172.16.3.68 – 172.16.3.68	172.16.3.68
70	172.16.3.69/32	172.16.3.69 – 172.16.3.69	172.16.3.69
71	172.16.3.70/32	172.16.3.70 – 172.16.3.70	172.16.3.70
72	172.16.3.71/32	172.16.3.71 – 172.16.3.71	172.16.3.71
73	172.16.3.72/32	172.16.3.72 – 172.16.3.72	172.16.3.72
74	172.16.3.73/32	172.16.3.73 – 172.16.3.73	172.16.3.73
75	172.16.3.74/32	172.16.3.74 – 172.16.3.74	172.16.3.74
76	172.16.3.75/32	172.16.3.75 – 172.16.3.75	172.16.3.75
77	172.16.3.76/32	172.16.3.76 – 172.16.3.76	172.16.3.76
78	172.16.3.77/32	172.16.3.77 – 172.16.3.77	172.16.3.77
79	172.16.3.78/32	172.16.3.78 – 172.16.3.78	172.16.3.78
80	172.16.3.79/32	172.16.3.79 – 172.16.3.79	172.16.3.79
81	172.16.3.80/32	172.16.3.80 – 172.16.3.80	172.16.3.80
82	172.16.3.81/32	172.16.3.81 – 172.16.3.81	172.16.3.81
83	172.16.3.82/32	172.16.3.82 – 172.16.3.82	172.16.3.82
84	172.16.3.83/32	172.16.3.83 – 172.16.3.83	172.16.3.83
85	172.16.3.84/32	172.16.3.84 – 172.16.3.84	172.16.3.84
86	172.16.3.85/32	172.16.3.85 – 172.16.3.85	172.16.3.85
87	172.16.3.86/32	172.16.3.86 – 172.16.3.86	172.16.3.86
88	172.16.3.87/32	172.16.3.87 – 172.16.3.87	172.16.3.87
89	172.16.3.88/32	172.16.3.88 – 172.16.3.88	172.16.3.88
90	172.16.3.89/32	172.16.3.89 – 172.16.3.89	172.16.3.89
91	172.16.3.90/32	172.16.3.90 – 172.16.3.90	172.16.3.90
92	172.16.3.91/32	172.16.3.91 – 172.16.3.91	172.16.3.91
93	172.16.3.92/32	172.16.3.92 – 172.16.3.92	172.16.3.92
94	172.16.3.93/32	172.16.3.93 – 172.16.3.93	172.16.3.93
95	172.16.3.94/32	172.16.3.94 – 172.16.3.94	172.16.3.94
96	172.16.3.95/32	172.16.3.95 – 172.16.3.95	172.16.3.95
97	172.16.3.96/32	172.16.3.96 – 172.16.3.96	172.16.3.96
98	172.16.3.97/32	172.16.3.97 – 172.16.3.97	172.16.3.97
99	172.16.3.98/32	172.16.3.98 – 172.16.3.98	172.16.3.98
100	172.16.3.99/32	172.16.3.99 – 172.16.3.99	172.16.3.99
101	172.16.3.100/32	172.16.3.100 – 172.16.3.100	172.16.3.100
102	172.16.3.101/32	172.16.3.101 – 172.16.3.101	172.16.3.101
103	172.16.3.102/32	172.16.3.102 – 172.16.3.102	172.16.3.102
104	172.16.3.103/32	172.16.3.103 – 172.16.3.103	172.16.3.103
105	172.16.3.104/32	172.16.3.104 – 172.16.3.104	172.16.3.104
106	172.16.3.105/32	172.16.3.105 – 172.16.3.105	172.16.3.105
107	172.16.3.106/32	172.16.3.106 – 172.16.3.106	172.16.3.106
108	172.16.3.107/32	172.16.3.107 – 172.16.3.107	172.16.3.107
109	172.16.3.108/32	172.16.3.108 – 172.16.3.108	172.16.3.108
110	172.16.3.109/32	172.16.3.109 – 172.16.3.109	172.16.3.109
111	172.16.3.110/32	172.16.3.110 – 172.16.3.110	172.16.3.110
112	172.16.3.111/32	172.16.3.111 – 172.16.3.111	172.16.3.111
113	172.16.3.112/32	172.16.3.112 – 172.16.3.112	172.16.3.112
114	172.16.3.113/32	172.16.3.113 – 172.16.3.113	172.16.3.113
115	172.16.3.114/32	172.16.3.114 – 172.16.3.114	172.16.3.114
116	172.16.3.115/32	172.16.3.115 – 172.16.3.115	172.16.3.115
117	172.16.3.116/32	172.16.3.116 – 172.16.3.116	172.16.3.116
118	172.16.3.117/32	172.16.3.117 – 172.16.3.117	172.16.3.117
119	172.16.3.118/32	172.16.3.118 – 172.16.3.118	172.16.3.118
120	172.16.3.119/32	172.16.3.119 – 172.16.3.119	172.16.3.119
121	172.16.3.120/32	172.16.3.120 – 172.16.3.120	172.16.3.120
122	172.16.3.121/32	172.16.3.121 – 172.16.3.121	172.16.3.121
123	172.16.3.122/32	172.16.3.122 – 172.16.3.122	172.16.3.122
124	172.16.3.123/32	172.16.3.123 – 172.16.3.123	172.16.3.123
125	172.16.3.124/32	172.16.3.124 – 172.16.3.124	172.16.3.124
126	172.16.3.125/32	172.16.3.125 – 172.16.3.125	172.16.3.125
127	172.16.3.126/32	172.16.3.126 – 172.16.3.126	172.16.3.126
128	172.16.3.127/32	172.16.3.127 – 172.16.3.127	172.16.3.127

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 /25
/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	-
/24	255.255.255.0	256	254	-
/25	255.255.255.128	128	126	1
/26	255.255.255.192	64	62	2 split →
/27	255.255.255.224	32	30	4 split →
/28	255.255.255.240	16	14	8 split →
/29	255.255.255.248	8	6	16 split →
/30	255.255.255.252	4	2	32 split →
/31	255.255.255.254	2	2	64 split →
/32	255.255.255.255	1	1	128 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 →