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Factors that affect the delay of DNS updates

If you change your DNS settings, it can take 1 or up to 48 hours until the updates are visible on the internet. We guarantee to implement your settings on our nameservers as soon as possible. However, there are some factors that influence the duration of the update which do not depend on the 1&1 systems.

In the Domain Name System (DNS), the TTL (Time To Live) indicates how long a DNS setting is valid until it is updated by the overlying nameserver.

Influences by your internet service provider (ISP) on TTL

ISPs use caches for DNS records (store the record locally rather than retrieving fresh data from nameservers) to speed up web browsing and reduce traffic, which delay the time until changes are visible to your visitors. Some ISPs ignore TTL settings and only update their cached records every two to three days. Although we ensure 1 hour for A/AAAA/MX/TXT/CNAME-records and 48 hours for NS-records, it might take up to 72 hours until the settings are visible.

Influences by the Domain Registries on TTL

If you change your domain name's nameservers, we submit your change request to the registry within minutes, and they publish your primary NS (nameserver) records within their root zone. Most registries update their zones continously.

For example, VeriSign refreshes zones for .com domain names every three minutes. However, not all registries make updates that often. Registries may protect their root nameservers from overuse by setting a high TTL of up to 48 hours or more for those NS records.

TTL Duration on 1&1 Nameservers
Updated Record TTL on 1&1 Nameservers Maximum propagation time
A/AAA/MX/TXTCNAME up to 1 hour up to 72 hours
NS up to 48 hours up to 72 hours