PublicDNS.info

United States ISP DNS Servers

16 internet service providers listed — 7 with known DNS server addresses. ISP DNS servers are typically private and only work for that ISP's customers.

All Countries Public DNS in United States Public DNS Servers
Note: ISP DNS servers are not public — they only work for customers of that specific ISP. If you want DNS that works from any connection, use public DNS servers instead.

Major National ISP

7 providers
Comcast Xfinity
AS7922
Position: Largest ISP in USA (~30% market share)
Coverage: 40 states
Technology: Cable (DOCSIS 3.1), Fiber
DNS Servers:
75.75.75.75
IPv4 Primary (Anycast)
75.75.76.76
IPv4 Secondary (Anycast)
2001:558:feed::1
IPv6 Primary
2001:558:feed::2
IPv6 Secondary
Uses DNS Anycast — same IP routes to nearest server
Xfinity gateways may intercept DNS queries
Charter Communications (Spectrum)
AS20115
Position: 2nd largest ISP (~28% market share)
Coverage: 41 states
Technology: Cable (DOCSIS 3.1)
DNS Servers:
209.18.47.61
Primary
209.18.47.62
Secondary
71.10.216.1
Regional
71.10.216.2
Regional
Formerly Time Warner Cable and Bright House Networks
DNS varies by legacy network/region
AT&T Internet
AS7018
Position: 3rd largest ISP (~14% market share)
Coverage: 21 states
Technology: Fiber (FTTH), DSL, Fixed Wireless
DNS Servers:
68.94.156.1
Primary
68.94.157.1
Secondary
68.94.156.9
Alternative Primary
68.94.157.9
Alternative Secondary
Formerly AT&T U-verse, SBC
Coverage based on former Bell System territories
Verizon (Fios)
AS701
Position: Major fiber ISP (~7% market share)
Coverage: 9 states (Northeast corridor)
Technology: Fiber (FTTH), Legacy DSL
DNS Servers:
1.243.0.14
Set 1 Primary
1.243.0.12
Set 1 Secondary
8.237.161.14
Set 2 Primary
8.237.161.12
Set 2 Secondary
68.238.96.14
Set 3 Primary
68.238.96.12
Set 3 Secondary
DNS varies significantly by region
Sold wireline in CA, TX, FL to Frontier
Cox Communications
AS22773
Position: Major regional cable ISP (~5% market share)
Coverage: 19 states
Technology: Cable (DOCSIS 3.1)
DNS Servers:
68.1.16.107
Primary
68.1.16.108
Secondary
Largest privately held cable company
DNS varies by regional market
CenturyLink (Lumen Technologies)
AS209
Position: Major telephone/DSL provider (~3% market share)
Coverage: 37 states
Technology: DSL, Fiber (limited)
DNS Servers:
205.171.3.66
Primary
205.171.202.166
Secondary
205.171.3.65
Alternative
205.171.2.25
Alternative
Formerly Qwest, Embarq
Known for NXDOMAIN hijacking
Altice USA (Optimum / Suddenlink)
AS6128
Position: 4th largest cable operator
Coverage: Northeast (Optimum), scattered (Suddenlink)
Technology: Cable, Fiber
DNS Servers: Not publicly documented — auto-assigned via DHCP
Optimum serves NY, NJ, CT, PA
Suddenlink serves smaller markets
DNS auto-assigned via DHCP

Fiber ISP

2 providers
Google Fiber
AS16591
Position: Fiber ISP (limited markets)
Coverage: 20+ cities across 10 states
Technology: FTTH (up to 8 Gbps)
DNS Servers:
8.8.8.8
Uses Google DNS by default
8.8.4.4
Uses Google DNS by default
Very limited availability
Custom DNS can be configured
Ziply Fiber
AS20055
Position: Regional fiber provider (Pacific Northwest)
Coverage: WA, OR, ID, MT
Technology: FTTH
DNS Servers: Not publicly documented — auto-assigned via DHCP
Acquired from Frontier (2020)
Expanding fiber aggressively

Fixed Wireless ISP

1 provider
T-Mobile Home Internet
AS21928
Position: 5G/4G fixed wireless
Coverage: Nationwide (where T-Mobile coverage available)
Technology: 5G, 4G LTE Fixed Wireless
DNS Servers: Not publicly documented — auto-assigned via DHCP
No data caps
Speeds vary by location and tower congestion

Satellite ISP

3 providers
Starlink (SpaceX)
AS14593
Position: Low Earth Orbit satellite ISP
Coverage: Continental US, Alaska, Hawaii, Puerto Rico
Technology: LEO Satellite
DNS Servers: Not publicly documented — auto-assigned via DHCP
Low latency (~30ms) compared to traditional satellite
No data caps
Mobile and Maritime service available
Viasat
Position: Geostationary satellite ISP
Coverage: Continental US
Technology: Geostationary Satellite
DNS Servers: Not publicly documented — auto-assigned via DHCP
Higher latency (~600ms)
Data caps on most plans
HughesNet
Position: Geostationary satellite ISP
Coverage: Continental US
Technology: Geostationary Satellite
DNS Servers: Not publicly documented — auto-assigned via DHCP
High latency
Data caps

Regional Cable ISP

1 provider
Mediacom
AS30036
Position: 5th largest cable operator
Coverage: 22 states (smaller markets, Midwest focused)
Technology: Cable (DOCSIS 3.1)
DNS Servers: Not publicly documented — auto-assigned via DHCP
Serves smaller cities and towns

Regional ISP

2 providers
Frontier Communications
AS5650
Position: Regional telephone/fiber provider
Coverage: 25 states
Technology: Fiber (FTTH), DSL
DNS Servers: Not publicly documented — auto-assigned via DHCP
Acquired Verizon wireline assets in CA, TX, FL
Significant fiber build-out underway
Windstream (Kinetic)
AS7029
Position: Regional telephone/DSL provider
Coverage: 18 states
Technology: DSL, Limited Fiber
DNS Servers: Not publicly documented — auto-assigned via DHCP
Primarily rural and small-town markets

Why change from ISP DNS?

  • Speed: ISP DNS can be slow or overloaded — public DNS is often faster.
  • Privacy: Some ISPs log or sell DNS query data.
  • Security: Services like Quad9 (9.9.9.9) block malicious domains.
  • Reliability: Public DNS providers offer 99.99%+ uptime.
  • Features: Ad-blocking (AdGuard), family filters (OpenDNS), DNSSEC validation.

Browse public DNS servers · Browse all countries

Last updated: January 2026. Data may be incomplete or outdated — ISPs change DNS servers without notice.