16.18.100.64/27

Public

Class A — /27 prefix — 30 usable hosts

Network Address

16.18.100.64

Broadcast Address

16.18.100.95

Subnet Mask

255.255.255.224

Usable Hosts

First Usable IP

16.18.100.65

Last Usable IP

16.18.100.94

Total IPs

Prefix Length

/27

Network address — the base address of the block (16.18.100.64). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 16.18.100.95 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 30 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.255.255.224 is the dotted-decimal equivalent of /27. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation	16.18.100.64/27
Network Address	16.18.100.64
Broadcast Address	16.18.100.95
Subnet Mask	255.255.255.224
Wildcard Mask	0.0.0.31
Prefix Length	/27
IP Address Class	Class A
Total IP Addresses	32
Usable Host Addresses	30
First Usable IP	16.18.100.65
Last Usable IP	16.18.100.94
Network (Hex)	0x10126440
Broadcast (Hex)	0x1012645F
Address Type	Public / Globally Routable

Binary Representation

Network Address

00010000.00010010.01100100 00010000.00010010.01100100.01000000

Subnet Mask

11111111.11111111.11111111.11100000

The first 27 bits (1s in the mask) identify the network. The remaining 5 bits identify hosts within the network.

Split into Equal Subnets

Split 16.18.100.64/27 into 2 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	16.18.100.64/28	16.18.100.64	16.18.100.65	16.18.100.78	16.18.100.79	14
2	16.18.100.80/28	16.18.100.80	16.18.100.81	16.18.100.94	16.18.100.95	14

Split 16.18.100.64/27 into 4 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	16.18.100.64/29	16.18.100.64	16.18.100.65	16.18.100.70	16.18.100.71	6
2	16.18.100.72/29	16.18.100.72	16.18.100.73	16.18.100.78	16.18.100.79	6
3	16.18.100.80/29	16.18.100.80	16.18.100.81	16.18.100.86	16.18.100.87	6
4	16.18.100.88/29	16.18.100.88	16.18.100.89	16.18.100.94	16.18.100.95	6

Split 16.18.100.64/27 into 8 equal /30 subnets (2 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	16.18.100.64/30	16.18.100.64	16.18.100.65	16.18.100.66	16.18.100.67	2
2	16.18.100.68/30	16.18.100.68	16.18.100.69	16.18.100.70	16.18.100.71	2
3	16.18.100.72/30	16.18.100.72	16.18.100.73	16.18.100.74	16.18.100.75	2
4	16.18.100.76/30	16.18.100.76	16.18.100.77	16.18.100.78	16.18.100.79	2
5	16.18.100.80/30	16.18.100.80	16.18.100.81	16.18.100.82	16.18.100.83	2
6	16.18.100.84/30	16.18.100.84	16.18.100.85	16.18.100.86	16.18.100.87	2
7	16.18.100.88/30	16.18.100.88	16.18.100.89	16.18.100.90	16.18.100.91	2
8	16.18.100.92/30	16.18.100.92	16.18.100.93	16.18.100.94	16.18.100.95	2

IP Address Sample

Showing first 16 of 32 total IPs.

16.18.100.64 net

16.18.100.65

16.18.100.66

16.18.100.67

16.18.100.68

16.18.100.69

16.18.100.70

16.18.100.71

16.18.100.72

16.18.100.73

16.18.100.74

16.18.100.75

16.18.100.76

16.18.100.77

16.18.100.78

16.18.100.79

… 16 more IPs …

/27 Subnet Reference

Total IPs 32

Usable Hosts 30

Subnet Mask 255.255.255.224

Wildcard 0.0.0.31

Full /27 reference →

Related Ranges

Parent /26 block 16.18.100.64/26 Sibling /27 block 16.18.100.96/27

Adjacent Prefix Sizes

/25 126 hosts /26 62 hosts /27 30 hosts /28 14 hosts /29 6 hosts