IPv4
IPv4 addresses network destinations using 32-bit addresses. A DNS record and a reachable address do not replace configuring and checking the service.
What does IPv4 mean?
IPv4 is a version of the Internet Protocol, which carries data packets between networks. Its addresses are 32 bits long; RFC791 describes transmission using source and destination addresses. The usual notation uses decimal numbers separated by dots. DNS maps such addresses to a name through A records.
Example: connecting a service over IPv4
A fictional portal is to be reachable through the server's assigned IPv4 address. The team configures the network connection, access rules and web service. Access through the portal name also needs a suitable DNS mapping.
Successful access over IPv4 says nothing about whether the same service works over IPv6. If both are offered, each needs suitable configuration and checking.
IP alone does not confirm successful processing in the business workflow. Even if packets reach the server, a login may fail or the application may reject a request.
Sources
Related terms
- IP addressAn IP address provides addressing on a network. It differs from a domain name and alone says nothing about the application reachable at that address.
- A recordAn A record maps a DNS name to an IPv4 address. It does not configure the website or define HTTPS, paths or an HTTP redirect.
- IPv6IPv6 uses 128-bit addresses. A portal offered over it needs matching DNS, network, server and access-rule configuration.
- Return-PathReturn-Path records the SMTP reverse path in a header. It explains the technical route for error reports, not a person’s identity.
- Envelope-FromEnvelope-From identifies the SMTP sender for transport and error feedback. It must be distinguished from the visible sender address.
- DMARC aggregate reportA DMARC aggregate report summarises a reporting mail system’s domain checks over a period. It helps examine sending sources and misconfigurations.
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