Category Archives: Uncategorized


Everything is New!  Okay, not everything but quite a few things…  You might have noticed that in the last 6 months we have added a number of new lookups, monitors and premium monitors.  Here’s a brief list to refresh your memory:


New features in the Professional interface.

With all the new features, we decided we needed to share the good news.  So, we’ve added a way that everyone can see our new features as we add them.  Clicking on “New!” either on the “More” Tools page or in the Professional interface will give you access to a list of tools we added in the last 90 days.

New features on the More Tools page.

New features on the More Tools page.

DNS Batch Tool

Have you ever needed to lookup DNS on a large list of IPs?  How about parsing a security log to see where a potential threat is coming from?  Combing through the log and getting the full list of IPs can be tedious and tiresome.  And, then you still have to run the DNS checks one-by-one or write a script to do it for you.

Or, you could come to MxToolbox where we have all the cool tools…

That’s right, we’ve launched a DNS Batch Lookup Tool that does all that for you.  Available to all MxToolbox Professional users, DNS Batch Tool eliminates the time-consuming work of parsing text for IP addresses and repetitive DNS lookups.

You can find it on the main menu of the MxToolbox Professional interface* along with our premium monitors like DNS Zone Protect and MailFlow Monitoring.


DNS Batch Tool provides takes simple text as the main input.


As, you can see below, I’ve copied an entire email into the tool so I can see lookup routing information for my most recent campaign.  I could also use security logs or a pre-generated list of IP addresses.


DNS Batch Tool parses the text file and automatically extracts all the IP addresses.



Processing these IP addresses yields reverse host name, country, region and city information, AS number and AS name.



Note: you must be a paid user to access MxToolbox Professional.

Reputation Lookup

Your domain’s reputation has become increasingly important to email deliverability, website accessibility, brand reputation and overall business performance.  No business can afford to ignore their domain’s online reputation.  Many companies, like Google and PhishTank, publish APIs to their online reputation databases, enabling businesses to check their online status or check the status of a website before accessing it.  However, researching and monitoring all these sites creates a lot of work.

Brand Reputation - Bad

A typical example of a domain with a poor online reputation.

Brand Reputation - Good

An example of a website with a good online reputation.

Fortunately, Mxtoolbox can help!  Our new Reputation Lookup tool provides you with a consolidated view of your domain’s online reputation.  On first release, our one-stop Reputation Lookup checks Google and PhishTank.  As we discover new reputation databases, these will be added to increase your insight into your online reputation.  Check out your domain in our tool!

Did DNS Propagate?

If you have multiple DNS servers, one of your biggest concerns is probably the propagation of changes across your pool of servers.  Once you make a change, add a record or remove a record is that record getting updated on all your servers?  Are you serving up the same records or is one server out of sync?   Are your registrar’s servers syncing your changes?

MxToolbox's DNS Propagation tool, available in Classic and Professional interfaces

MxToolbox’s DNS Propagation tool, available in Classic and Professional interfaces

MxToolbox is happy to announce our new DNS Propagation tool.  Our tool checks all of your DNS servers simultaneously when you lookup a record, compares the Start of Authority record to all servers and highlights the server(s) that are different.  In one lookup, you can view the propagation of your records across your entire DNS pool.


A well-timed search for’s A record shows them in the process of propagation across servers.

Are your emails deliverable?

One of the biggest concerns in email marketing and online commerce is the deliverability of email.  Can you do business if the email server at your target customers refuses to accept your email?

There are many types of email deliverability rankings, some focus on marketing deliverability to specific customers, bulk email services or even online management of email reputation.  MxToolbox focuses on the fundamental questions of email function:

  • Are your email headers properly formed?
  • Is SPF configured properly?
  • Is DKIM configured?  And, what is the signature?
  • What’s the round trip processing time and for each hop in the email?

Our new Email Deliverability analysis tool provides insight into your email configuration which will help you ensure email delivery to your customers, prospects and business partners.

Email Deliverability Report

An example MxToolbox email deliverability report.

Looking Up ASN

Autonomous System Numbers or ASNs are provided by Internet registries to Internet Service Providers as a unique identifier of their network.  ISPs may have multiple networks and therefore multiple ASNs, one for each non-contiguous subnet, which may get confusing for network managers or customers, as you can see in this example below.  ASNs are also used to configure Border Gateway Protocol (BGP) between two networks or between two subnets.

ASN Lookup Example

Level 3 Communications owns multiple ASNs. With our tool, it’s easy to find the appropriate one for your project.

MxToolbox has developed an ASN Lookup Tool that takes an ISPs name and returns the ASNs they own. In addition, the tool can accept an ASN and return the name of the owner.  This tool can be useful for network managers working with large ISPs or trying to determine ownership of a particular ASN or attempting to setup BGP.


More threats to DNS

As reported by Cisco, Domain Shadowing attacks have risen more that 4x in the last year.  This is a disturbing trend, that concerns all businesses, whether small, medium or large.  DNS Shadowing attacks utilize a business’s reputation to acquire access to important personal or financial information typically by leveraging a subdomain of the business.  For example, an attacker with access to your DNS configuration can setup an subdomain and route your customers to a website with your look, feel and branding.  From there, your customers will be prompted to login, and expose their credentials and personal information.

This type of threat even affects government agencies, as recently seen with the St. Louis Federal Reserve.  Attackers gained access to the DNS servers and added a subdomain on a foreign server where they gathered login credentials from researchers.   While gathering researchers credentials may not seem frightening, there is potential that these credentials could have been leveraged to access more financially relevant systems.

Incidents like these highlight the need for multi-layered threat protection that protects your servers and your reputation across multiple technologies and externally monitors threats.  At MxToolbox, we offer comprehensive monitoring solutions, like DNS Zone Protect, to help protect our customers from new and emerging threats. DNS Zone Protect gives you peace of mind knowing that changes to your DNS are being externally monitored by MxToolbox.

Did your DNS change last night?

As your company grows, so does access to your DNS.  Often multiple groups can make changes to DNS: Development, IT Operations, Marketing and even consultants.  Keeping track of who has access and what changes were made or were not made can be a difficult, but important exercise. Servers on subdomains left publicly visible long after the project is over can be used for exploitation by attackers.  Or, someone could inadvertently tell the world about a new product by setting up the subdomain early.  Finally, there is real risk in someone making an unauthorized change to DNS that shuts down critical systems.  Monitoring your DNS for changes is a business-critical task.

MxToolbox recently launched DNS Zone Protect, a monitoring solution for all your DNS, that gives you immediate warning when any change is made to your DNS.  With DNS Zone Protect, you get peace of mind knowing that changes to your DNS are being externally monitored by MxToolbox.

A new threat to your reputation via DNS

We’ve heard time and again that phishing attacks are the most popular method to obtain access to sensitive company data, but now, phishing is being used to get access to DNS. Lately, a new attack called DNS Shadowing has become increasingly popular, with growth of over 300% in the last year, and it threatens your online reputation.

DNS Shadowing involves phishing or otherwise obtaining access to your DNS accounts. From there, an intruder can create subdomains of your domain and point these entries to their servers without your knowledge. They use these false entries as part of email campaigns to your customers to gather credit cards and financial information. Since these attacks have legitimate appearing sites on URLs that appear to be part of your networks, it appears that you are asking for this information! Your reputation can be used to attack consumers that don’t even have business with you. Talk about a blow to your online reputation!

MxToolbox recently launched DNS Zone Protect, a monitoring solution for all your DNS, that gives you immediate warning when any change is made to your DNS. With DNS Zone Protect, you get peace of mind knowing that changes to your DNS are being externally monitored by MxToolbox.