What Is an IP Address? IPv4, IPv6, Public and Private

An IP address is the network label that lets a device or server send and receive internet traffic. IPv4 is the older dotted format, IPv6 is the newer colon-separated format, public addresses face the internet, and private addresses stay inside local networks.

The Useful Definition

The letters IP stand for Internet Protocol. In plain English, an IP address tells networks where a request came from and where the reply should go.

That sounds abstract until you rent a server. Your web app, DNS records, firewall rules, CDN settings, mail delivery, and access logs all depend on addresses being predictable enough to route traffic and restrictive enough not to expose private services.

An IP address is not the same thing as a domain name. A domain is the readable label. DNS turns that label into an address that machines can route.

IPv4 and IPv6

IPv4 and IPv6 are address formats, not hosting products. A provider may support one, both, or a partial mix depending on the product, region, and control panel.

Do not treat IPv6 support as a marketing checkbox. A site can look fine from your office and still fail for users behind older networks, brittle firewalls, or hosting panels that expose IPv6 poorly.

Public, Private, Static, and Shared

The first split is public versus private. A public IP is reachable from the internet. A private IP is meant for internal traffic inside a network, project, VPC, office, or home router.

For hosting, public addresses are the ones you usually point DNS at. Private addresses are useful for database traffic, internal APIs, backup networks, and service-to-service communication that should not be visible to the public internet.

The second split is static versus dynamic. A static address is meant to stay attached to the service until you release or change it. A dynamic address can change when the instance, router, or provider policy changes.

The third split is dedicated versus shared. A dedicated address belongs to your server or account context. A shared address can sit behind NAT, reverse proxying, CDN routing, or platform hosting where many customers use the same public edge.

Shared addressing is not automatically bad. It is normal for CDN and platform products. It becomes a problem when you need clean mail reputation, strict allowlists, direct TLS troubleshooting, or audit trails tied to one workload.

How Servers Use IP Addresses

On a plain VPS, the public IP is often the first operational boundary. You attach DNS records to it, allow traffic to it, block unwanted sources, and read it in logs when something breaks.

Cloud and CDN products add another layer. Cloudflare can put its network in front of an origin, so visitors hit Cloudflare addresses while your server address stays behind the edge. That helps, but it changes how logs and firewall rules should be read.

Infrastructure providers expose addresses differently. AWS, DigitalOcean, Hetzner, OVHcloud, and Vultr all sell or attach compute, cloud, or server products where address handling matters to deployment, access control, and migration.

The practical question is not whether a provider has IP addresses. Every internet-facing provider does. The useful question is what you control: address assignment, reverse DNS, IPv6 availability, firewall defaults, failover, and whether changing servers forces a DNS or allowlist change.

Hosting Checks That Actually Matter

If you are choosing hosting, an IP address affects more than the first DNS record. This is the place to rent boring infrastructure and inspect the edges before launch.

• DNS binding: confirm whether the address you receive is meant for A records, AAAA records, or provider-managed edge routing.
• Mail reputation: assume the cheap plan is crowded until reverse DNS, abuse history, and outbound mail policy say otherwise.
• Access control: inspect whether your database, admin panel, and SSH access can stay on private networks or strict allowlists.
• Migration risk: find out whether the address can move with the service or whether a rebuild means DNS changes.
• CDN fit: decide whether users should reach the origin directly or only through a provider such as Cloudflare.

This is where glossary articles usually stop too early. For hosting, the address type is part of the operating model. It changes how you recover from outages, rotate servers, isolate private services, and explain traffic in logs.

When to Choose or Avoid Each Setup

Choose a dedicated public IP when the workload needs direct DNS, strict allowlists, mail reputation work, or predictable firewall policy. This is common for VPS hosting, control panels, and services that other systems call directly.

Choose private addressing for databases, queues, monitoring agents, and internal APIs. If a component does not need public traffic, exposing it to the internet is usually a self-inflicted support problem.

Choose CDN or edge addressing when you want caching, DDoS filtering, TLS handling, or global routing in front of the origin. The tradeoff is that source IP handling and firewall design need more care.

Avoid address setups you cannot explain before launch. If the provider panel hides whether traffic reaches your server directly, through NAT, or through an edge network, troubleshooting gets slower when the site is already live.

A Small Decision Table

Use this table as a procurement filter, not a network design. The exact setup still depends on your provider, region, operating system, and how much control the product exposes.

Public Freshness Note

HostScout compares provider profiles and plan surfaces before publication, but IP behavior is often product-specific. Treat this guide as the checklist for questions to ask, then verify the current address, IPv6, firewall, reverse DNS, and migration rules in the provider panel before paying.

Bottom Line

An IP address is basic plumbing, but hosting mistakes around it are expensive. Before you buy, decide whether the workload needs a public address, a private network, a CDN edge, or a static address that survives operational changes.