Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
IP address starvation is a shortage of usable IP addresses relative to demand. In broad Internet discussions, it usually means the limited supply of public IPv4 addresses; within an organization, it can also mean that a local address plan or DHCP pool is too small for the devices that need to connect.
What does IP address starvation mean?
The phrase describes a mismatch: a network or address pool cannot provide enough addresses for its users and devices. It is descriptive, not the name of a standardized networking feature.
At Internet scale, the term generally refers to scarcity of public IPv4 addresses. A company or campus may use it for a more local problem, such as an address plan designed for fewer devices than now connect. Cisco’s BYOD white paper describes how the growth in employee-connected devices can outgrow legacy enterprise address plans.
Why are public IPv4 addresses scarce?
IPv4 uses a 32-bit address field, allowing about 4.3 billion theoretical address values. That is not the number of public addresses available for ordinary assignment: private-use, multicast, reserved, and other special-purpose ranges are not generally usable as public host addresses. The IANA IPv4 Address Space registry records allocations and special-purpose blocks.
#1 Best Overall
The 4.3-billion figure is a theoretical total, not a current count of available public IPv4 addresses. A single current availability figure would depend on what is being counted—for example, address space held by IANA, unallocated regional pools, reserved blocks, or addresses available through transfers.
How do IPv6 and NAT address the shortage?
IPv6 expands address capacity
IPv6 uses 128-bit addresses rather than IPv4’s 32 bits. The Internet Engineering Task Force explains in RFC 8200 (2017) that the larger address size supports a much greater number of addressable nodes. IPv6 gives networks far more room to assign addresses as they grow, but it requires IPv6-capable equipment and services. Networks also need to account for IPv4-only destinations during migration; IPv6 deployment does not instantly remove the need to support IPv4.
Rank #2
- Used Book in Good Condition
NAT lets devices share public IPv4 addresses
Network address translation (NAT), including network address and port translation (NAPT), allows multiple internal devices to share one or more public IPv4 addresses. This conserves public IPv4 addresses, but it does not create new ones or expand the IPv4 address space. Nokia’s SR OS NAT documentation describes this shared-access role in the context of IPv4 and IPv6 coexistence.
NAT is a continuity measure while IPv4 resources remain necessary, not a substitute for IPv6 capacity. Its stateful mappings can affect inbound connections and network operations, and access to IPv4 resources depends on translation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Is IP address starvation the same as a DHCP starvation attack?
No. A DHCP starvation attack is a separate, local security problem. An attacker repeatedly requests DHCP addresses to consume the server’s available lease pool, potentially preventing legitimate devices from receiving an address. The term refers to deliberately draining a local pool, not to the global shortage of public IPv4 addresses. Research by Mayoon Yaibuates and Roungsan Chaisricharoen in the Malaysian Journal of Computer Science (2019) discusses detection and recovery for this attack.
Quick Recap
Best Value
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
