Status - DNSimple Blog

Incident Report - Service Outage (February 10th, 2026)

On February 10th, 2026, we experienced a full service outage that affected name resolution, the website, and the API. This post explains what happened and how we have addressed it.

Anthony Eden

Incident Report - Partial DNS Outage (April 7th, 2025)

On Monday, April 7th, 2025, we experienced a partial DNS outage that caused name servers to fail to respond to DNS queries in a timely fashion.

Amelia Aronsohn

Incident Report - Partial DNS Outage (March 2nd, 2021)

On March 2nd, 2021, multiple regions of the DNSimple authoritative DNS network failed to respond properly to a portion of queries received. This post explains how we addressed this incident.

Anthony Eden

Incident Report - Partial DNS Outage (November 1st, 2020)

On Sunday, November 1st, 2020, we experienced a partial DNS outage that caused some of our name servers to fail to respond to DNS queries in a timely fashion. This post explains the cause of the incident and how we have addressed it.

Anthony Eden

Incident Report - Partial DNS Outage (October 10th, 2020)

On Saturday, October 10th, 2020, we experienced a partial DNS outage impacting four of our six datacenters. This post explains what the cause was and how we have addressed it.

Anthony Eden

Incident Report - DNS Outage (July 17th, 2020)

On Friday, July 17th, we had a partial DNS outage that impacted several of our regions.

Anthony Eden

Incident Report - Amsterdam Data Center DNS Failure (April 14th, 2020)

On April 14th, 2020 we experienced an ALIAS record resolution outage in our Amsterdam data center.

Anthony Eden

Incident Report - Partial DNS Outage in Tokyo (March 12th, 2016)

Early Sunday morning we experienced a partial DNS outage due to routing issues in our Tokyo data center. Here's what happened and what we're doing about it.

Jacobo García López de Araujo

New phishing emails sent to domain registrants

A new phishing attack targeting eNom has been identified. Here's what to watch out for.

Joseph Caudle

Incident Report - Partial DNS Outage in San Jose and Tokyo (January 18th, 2016)

Three days ago we experienced a partial DNS outage due to SERVFAIL errors. Here's what happened and what we're doing about it.

Mak Arnautovic

Phishing emails sent to domain registrants

As an advisory to customers, please watch out for phishing attempts claiming suspension of your domains. Here's what to do if you see something phishy.

Joseph Caudle

Incident Report - European Outage and Application Errors (May 20th, 2015)

On Thursday, May 20th, our Amsterdam data center had a period of downtime due to a Denial of Service attack. Additionally, during the attack we were unable to execute DNS queries outbound from our application servers in Virginia. Here is what we know so far and what we're doing about it.

Anthony Eden

Incident Report - San Jose Region and Redirector Service Outage (May 9th, 2015)

Last Friday our San Jose region and Redirector service suffered an outage along with our Europe region being under a Denial of Service attack. Here is what happened and what we're doing about it.

Aaron Kalin

Incident Report - Redirector and Zone Server Outage (April 22nd, 2015)

Today our redirector suffered an outage and zone changes were delayed. Here's what happened and what we're doing about it.

Joseph Caudle

Incident Report - DDoS Attack (December 1st, 2014)

On Monday, December 1st, 2014, we experienced a major volumetric DDoS attack aimed at a customer's domain. Here is our full report.

Anthony Eden

Incident Report - DDoS Attack (September 19th, 2014)

On Saturday, September 19th, 2014, we experienced a significant DDoS attack aimed at one of our customer's domains. Read on for the full report.

Anthony Eden

Incident Report - Amsterdam Data Center DNS Failure (February 20th, 2014)

On Thursday, February 20th, 2014, there was an outage in our Amsterdam data center. This post mortem describes the event, why it happened, what we did to recover, and what are doing to prevent similar issues in the future.

Anthony Eden

Incident Report - NTP Attack (December 23rd, 2013)

On December 23rd, 2013 we experienced an NTP attack that caused our unicast NS1 server to be taken offline for 24 hours. Triggered by this event we switched almost every one of our customers over to Anycast within a few days.

Anthony Eden

Incident Report - DNS Outage due to DDoS Attack (June 3rd, 2013)

Several days ago we detected the start of a DNS amplification attack. This attack was nothing special until the morning of June 3rd when it changed in a manner causing an outage for DNSimple name servers.

Anthony Eden

Incident Report - DNS changes blocked (May 20th, 2013)

On May 20th, beginning at about 11:30am Pacific time (18:30 UTC), we experienced a partial service outage. A component failure blocked our customers from updating their DNS records.

Darrin Eden

Sporadic ALIAS record resolution failure

Post mortem of the ALIAS record resolution failure on April 6th.

Darrin Eden

Partial DNS outage

On Friday, March 8th we had a partial DNS outage. Available and well performing DNS is a critical utility for the businesses our customers are running.

Darrin Eden

Incident Report - DNS Outage (July 23rd, 2012)

From approximately 09:35 UTC until 10:00 UTC, July 23rd 2012, DNSimple experienced an outage across four name servers. This outage appears to be the result of a distributed denial of service (DDoS) attack. Due to the attack we were unable to respond to DNS requests in a timely fashion. Our job processing queue simultaneously stopped due to a failed deployment. The backup in the job queues resulted in new subscriptions timing out and impacted customers updating DNS records.

Anthony Eden

Incident Report - Name Server Performance Degradation (February 15th, 2012)

Today all of our name servers experienced performance degradation that in turn caused customer sites to fail to resolve. This was especially evident to customers who are using our ALIAS record type.

Anthony Eden