In a connected world, the DNS perimeter has drastically expanded as global workforces now utilize multiple devices to connect to the Internet – increasing your network’s load and exposure. This expansion not only increases performance demands, but also limits your visibility into the threats that are targeting and infecting your networks, ultimately putting your organization in harm’s way. Despite your current safety measures and security provisions, malware still bypasses network defenses, costing you more time and money on cleanups – as well as hindering network performance.

Learn Why Recursive DNS Matters in the Connected World. Download Report

Neustar UltraRecursive is a cost effective enterprise grade, cloud-based recursive DNS service that delivers fast and reliable access to vital online applications with built-in security and threat intelligence.

Fast Performance

Quickly resolves queries through a highly reliable, global DNS infrastructure. The UltraRecursive nodes are co-located with Neustar’s authoritative and top-level-domain (TLD) servers, providing near-zero latency responses and instant cache updates for the zones that Neustar hosts.

Early Detection

Stops threats at the first point of contact and blocks malware before it reaches networks or endpoints by using Neustar and third-party threat intelligence feeds.

Effective Protection

Mitigates threats by preventing access to malicious websites known for malware, phishing, spyware and bots. Blocks unwanted and inappropriate content with the use of pre-defined category based web filtering and custom white/black lists.

Easy Deployment

Cloud-based, managed solution adds an extra layer of performance and security without the need for appliances, installations or additional configurations; saving time and money – all with the added benefits of a web-based portal, detailed reporting and industry leading SLAs.

DDoS Protection

Built-in DDoS protection to defend against attacks towards UltraRecursive and to ensure that your DNS does not become a source for future DDoS attacks against others.


Need Simple Recursive DNS? Try Our Free Service.

Provided free of charge, Free Recursive DNS enables end users and businesses to experience a much more reliable, faster and safer Internet experience.

Free Recursive DNS Blocking Level Categories Blocked IP Addresses
Reliability & Performance 1 None N/A IPv4:,

IPv6: 2610:a1:1018::1, 2610:a1:1019::1
Reliability & Performance 2* None N/A IPv4:,

IPv6: 2610:a1:1018::5, 2610:a1:1019::5
Threat Protection Low Malware, Ransomware, Spyware & Phishing IPv4:,

IPv6: 2610:a1:1018::2, 2610:a1:1019::2
Family Secure Medium Low + Gambling, Pornography, Violence & Hate/Discrimination IPv4:,

IPv6: 2610:a1:1018::3, 2610:a1:1019::3
Business Secure High Medium + Gaming, Adult, Drugs, Alcohol & Anonymous Proxies IPv4:,

IPv6: 2610:a1:1018::4, 2610:a1:1019::4

*These IPs will not redirect NXDomain (Non-existent Domain) responses to a landing page.

Free Recursive DNS Blocking Levels and Descriptions

Reliability & Performance: for users that want reliable and fast DNS lookups without blocking any specific categories.

Threat Protection: for users who want protection against malicious domains for security purposes. Includes Reliability & Performance

Family Secure: for families that want to ensure children don’t have access to mature content. Includes Reliability & Performance + Threat Protection

Business Secure: for businesses that want to ensure employee productivity by blocking unwanted and time-wasting content. Includes Reliability & Performance + Threat Protection + Family Secure

Router DNS Change

If you have a router on your network, we recommend that you modify your DNS settings there. This way, you typically only have to make one change, as opposed to making a change to each computer or device on your network.

View Router Change Instructions

  1. Login to your router

    To login and configure your router, you need to use a web browser. Simply type in your routers IP address to get started.

    If you don't know the IP address for your router, it is typically one of the following:

    If you have forgotten your router's username and/or password, the most common username is "admin" and the password is either blank, "admin" or "password." Most new routers now have unique usernames and passwords written directly on them.

  2. Find the DNS server settings

    Look for "DNS" next to a field which allows two or three sets of numbers (these fields may be empty).

  3. 3. Put in your desired Free Recursive DNS server IP addresses and click save/apply

    Please write down your current DNS settings, in case you want to return to your old settings for any reason.

Computer DNS Change

Instructions for Windows

  1. Select Control Panel from the Start menu.
  2. Click Network or Network and Sharing Center from the Control Panel choices.
  3. Right click on your connection and click Properties.
  4. Select Internet Protocol (TCP/IP) and click Properties.
  5. Click Use the following DNS server addresses and type in the desired Free Recursive DNS addresses in the Preferred DNS server and Alternate DNS server fields. Please write down your current DNS settings, in case you want to return to your old settings for any reason.

Instructions for MAC OS X

  1. Select System Preferences from the Apple menu (top left).
  2. Click Network icon.
  3. Click Advanced... button at the bottom right of the screen.
  4. Add the desired Free Recursive DNS addresses in the DNS Servers field, then click OK. Please write down your current DNS settings, in case you want to return to your old settings for any reason.

Configure DNS on Mobile Devices

Instructions for Android

  1. Go to Wi-Fi settings on your Android device.
  2. Select Wi-Fi on the menu, then the Wi-Fi network you want to use.
  3. Press and hold the network name you want to connect to.
  4. Select Modify network config - on some devices you may need to select “Advanced” for additional settings.
  5. Switch the IP settings from DHCP to static - the Android device will populate the IP address it has acquired via DHCP.
  6. Replace the DNS 1 and DNS 2 with desired Free Recursive DNS IP addresses. Please write down your current DNS settings, in case you want to return to your old settings for any reason.

Instructions for iOS

  1. While connected to a wireless network, open Settings app, click on the “Wi-Fi” option.
  2. Click on wireless network for which you wish to change DNS settings.
  3. Click on the DNS option under the settings, enter desired Free Recursive DNS IP addresses.
  4. Click “Wi-Fi Networks” arrow (top left) to save the settings. Please write down your current DNS settings, in case you want to return to your old settings for any reason.

Free Recursive DNS Terms of Service