Definition
A shared IP is an address used by many senders through one provider, pooling reputation and splitting cost. A dedicated IP is used by a single sender, giving complete control over reputation but requiring warm-up and consistent volume to maintain.
There is no universally better option. Shared IPs suit lower volume and senders who cannot manage a warm-up; dedicated IPs suit high volume and senders for whom reputation control is critical.
The right choice depends on volume, reputation sensitivity, and operational capacity. New and low-volume senders usually start on shared IPs, then migrate to dedicated as they grow and can support a warm-up. Providers manage shared-pool vetting, but a dedicated IP gives you full control at higher cost and effort.
How to Choose
Choose shared IPs when your volume is low, your list is healthy, and you are comfortable with provider-managed reputation. Choose dedicated IPs when volume is high, reputation matters to your business, or shared-pool behaviour is hurting placement.
Many providers let you start on shared IPs and migrate to dedicated as you grow.
Why It Matters
The shared-versus-dedicated decision shapes your cost, control, and deliverability for years. Understanding the trade-off prevents the two most common mistakes: buying a dedicated IP before you have the volume to warm it, or staying on a shared pool that limits your growth.
Best Practices
- Choose shared IPs for low volume and limited control needs.
- Choose dedicated IPs for high volume and brand-critical sending.
- Warm up dedicated IPs carefully before full load.
- Start on a shared IP if you are new or low volume, then reassess as you grow.
- Choose a dedicated IP when volume justifies the warm-up effort and reputation control.
- Warm a dedicated IP gradually with engaged contacts.
- Monitor complaint and bounce rates regardless of IP type.
- Ask your provider how neighbouring senders are vetted on a shared IP.
Was this useful?
Related Glossary Terms
Abuse Complaint
An abuse complaint is a report from a recipient who marks an email as spam, which negatively affects sender reputation and deliverability.
Account-Based Marketing Email
An account-based marketing email is a highly targeted message sent to a specific organisation or decision-maker group as part of a focused B2B strategy.
Alt Text
Alt text is the written alternative to an image in an email, displayed when images are blocked, slow to load, or consumed by screen readers.
Announcement Email
An announcement email is a dedicated campaign that communicates a specific update, milestone, or change to subscribers, from product launches and feature releases to company news and events.
AOL Mail for Email Marketers
AOL Mail is a legacy email provider with specific deliverability requirements and rendering quirks, now operating as part of the Yahoo+AOL network under shared infrastructure.
Email Authentication Protocols
Email authentication protocols are technical standards that verify the identity of an email sender, helping mailbox providers distinguish legitimate mail from spam and phishing.
Frequently Asked Questions
A shared IP is used by multiple senders and pools reputation; a dedicated IP is used by one sender with exclusive reputation control.
Shared IPs are usually better initially because providers manage reputation and there is no warm-up burden. New and low-volume senders usually start on shared IPs, then migrate to dedicated as they grow and can support a warm-up.
Yes, if other senders on the shared pool damage its reputation. Providers mitigate this by vetting senders. Providers manage shared-pool vetting, but a dedicated IP gives you full control at higher cost and effort.
When your volume and reputation needs justify the warm-up effort, typically at higher sustained volumes. The right choice depends on volume, reputation sensitivity, and operational capacity.
Usually yes, and it also requires warm-up and consistent volume to stay effective. New and low-volume senders usually start on shared IPs, then migrate to dedicated as they grow and can support a warm-up.