The 32-bit version of IP addressing. It remains the address format you will see most often in log data and threat indicators.
Also called Internet Protocol version 4.
Read more: Microsoft Learn
In the Ultra Transcenders books
Each book explains IPv4 in context, with comparison tables and the common traps.
Terms in this definition
- FORMAT
A DAX function that turns a value into text according to a format string, for instance "MMMM" to show a month's name. Since the output is text, numeric operations can't use it, and dynamic format strings were introduced to get around that.
Related terms
- A record
Points a DNS name at an IPv4 address. A typical use is pointing a root (apex) domain at an app.
- AAAA
Maps a hostname to an IPv6 address in DNS; IPv4 addresses use A records.
- ARP
Finds which MAC address belongs to an IPv4 address on the local segment.
- Azure reserved addresses
Five addresses in each subnet that Azure keeps for itself: the network address, the default gateway, two for Azure DNS and the broadcast address. A /24 therefore offers 251 usable addresses and a /29 only 3; IPv4 subnets of /30 or /31 aren't allowed.
- Dual-stack
A virtual network or subnet that has an IPv6 range alongside its IPv4 one. IPv6 subnets are always /64, drawn from the VNet's IPv6 space and added to a subnet that already exists.
- IP access list
Only connections from the IPv4 addresses or CIDR ranges entered here are allowed. An OpenSharing open recipient accepts at most 100 entries, set up separately from the lists that protect a workspace.
- IP network rule
A storage firewall entry (
IpRules) permitting a public IPv4 address or CIDR range, for example an on-premises egress range. An account can hold up to 400; they cannot match private addresses and do not affect requests from the same Azure region. - IPv6
Addressing based on 128 bits, available in Standard public IPs and dual-stack VNets. Public IPs for Azure Firewall and Bastion have to be IPv4.