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https://xfinity.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
93
GRADE
A
FIX
1
REVIEW
2
PASS
6
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
6 PASS 2 REVIEW 1 FIX
D
CDN & Delivery
Action
No CDN detected
FIX
No CDN detected
Warning::
No CDN detected
A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.
No CDN detected

Consider using a CDN to improve global delivery speed and reduce origin load.

B
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
www/non-www, trailing slash, HTTP→HTTPS
Critical::
HTTP version does not redirect to HTTPS
Got: HTTP 0 Expected: 301 redirect to HTTPS

www / non-www

403https://www.xfinity.com/
200https://xfinity.com/

HTTP → HTTPS

http://xfinity.com/

HTTP version does not redirect to HTTPS

B
TLS Certificate Expiry & Recommendations
176 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

176
days left
0d 30d 60d 90d+

Recommended actions

  • Prefer TLS 1.3 — TLS 1.2 is acceptable but TLS 1.3 removes RSA key exchange and improves latency
  • Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+
DNS Records
1 A records, 164 ms lookup
PASS
1 A records, 164 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 96.99.240.155
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
Has 1 IPv6 (AAAA) record(s)
Got: 2001:558:feed:dc:96:99:240:155
Info::
5 nameserver(s) configured
Got: dns104.comcast.net, dns102.comcast.net, dns101.comcast.net, dns103.comcast.net, dns105.comcast.net
Info::
6 mail exchanger(s) configured
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Info::
DNS resolution time: 164 ms
Got: 164 ms
A96.99.240.155
AAAA2001:558:feed:dc:96:99:240:155
CNAME—
NSdns104.comcast.net, dns102.comcast.net, dns101.comcast.net, dns103.comcast.net, dns105.comcast.net
MX
5 mx1c1.comcast.net
5 mx1h1.comcast.net
5 mx2c1.comcast.net
5 mx2h1.comcast.net
5 mx1a1.comcast.net
5 mx2a1.comcast.net
TXT
SPF v=spf1 -all
google-site-verification=KqEt_C6gzuYBzr08xM7T6e5yXNmsxUAMu8ZtNQejaCs
google-site-verification=jbytp59dW82AQqr9wK5V9-uZhr0wXrCJ7n9U3mUilQg
google-site-verification=TdiYkU4LcqtDvZoxDOjjUQwrrUnjS0wTKriu25iH-38
apple-domain-verification=XqlyQica-2VyxgDz4zdPt1gCVxZ9oHyW13971aF8rbY
CAALookup not available with standard resolver
Resolved in 164 ms

Multiple A records provide failover if one server goes down.

Why this matters

Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.

Learn more ▾

Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.

Source: SRE practice / DNS architecture

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

Why this matters

Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.

A
Redirect Chain
1 redirect(s), 583 ms total
PASS
1 redirect(s), 583 ms total
Info::
Single redirect
Got: https://xfinity.com → https://www.xfinity.com/ (301)
Info::
WWW normalization redirect
Info::
Redirect overhead: 583 ms total
Got: 583 ms

https://xfinity.com

472 ms · HTTP/1.0

301

https://www.xfinity.com/

111 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://xfinity.com301472 msHTTP/1.0BigIP
2https://www.xfinity.com/403111 msHTTP/1.1

See the visual redirect chain in the HTTP Probe tab →

A+
IPv6 Readiness
IPv6 reachable (117 ms)
PASS
IPv6 reachable (117 ms)
Info::
IPv6 is configured and reachable at 2001:558:feed:dc:96:99:240:155
Got: 117 ms connect
IPv6 Ready
AAAA Records 2001:558:feed:dc:96:99:240:155 Connection Reachable (117 ms)
A+
Crawlability
robots.txt present, sitemap with 282 URLs
PASS
robots.txt present, sitemap with 282 URLs
Info::
robots.txt is present
Got: 690 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 282 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 690 B Sitemaps referenced 6 User-agents * Blocking No — crawling allowed
# Comcast 

# robots.txt for https://www.xfinity.com 

# Updated on 2/19/26 by ER


User-agent: *

Disallow: /lp/

Disallow: /shop/

Disallow: /localize/

Disallow: /localization/

Disallow: /search

Disallow: /*ss4298525

Disallow: /support/preview/

Disallow: /xcm/

Disallow: /buy/

Disallow: /Checkout/

Disallow: /learn/tenant/*

Disallow: /support/mobile/device-troubleshooting


sitemap: https://www.xfinity.com/sitemap.xml

sitemap: https://www.xfinity.com/sitemap-hub.xml

sitemap: https://www.xfinity.com/sitemap-ss.xml

sitemap: https://www.xfinity.com/support/sitemap.xml

sitemap: https://www.xfinity.com/local/sitemap.xml

sitemap: https://www.xfinity.com/stream/sitemap.xml
sitemap.xml 200 OK
Type URL Set URLs 282 entries Valid XML Yes
Sample URLs:
A+
Domain Intelligence
xfinity.com — via CSC Corporate Domains, Inc., 23 years, 7 months old
PASS
xfinity.com — via CSC Corporate Domains, Inc., 23 years, 7 months old
Info::
Domain registered until Jan 23, 2027 (9 months remaining)
Info::
DNSSEC is enabled
Info::
Registrar: CSC Corporate Domains, Inc.
Warning::
Registrar lock is NOT enabled
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Domain expiry

190 days

January 23, 2027

SSL certificate

176 days

Issued by Sectigo Limited

Domain age

23 years, 7 months

Registered January 23, 2003

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Unknown

2001:558:feed:dc:96:99:240:155

Registrar

CSC Corporate Domains, Inc.

Unlocked 5 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar CSC Corporate Domains, Inc.
Created January 23, 2003 (23 years, 7 months ago)
Expires January 23, 2027 (9 months)
Last Updated April 20, 2026
Name Servers dns101.comcast.net, dns102.comcast.net, dns103.comcast.net, dns104.comcast.net, dns105.comcast.net
DNSSEC Enabled
Hosting
IP Address 2001:558:feed:dc:96:99:240:155
Data source: rdap (0.1s)

The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.

Why this matters

Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.

Learn more ▾

Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.

Source: ICANN / domain-security best practice

A
HTTP Probe Timing
Total 546 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
157 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
96 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
196 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
546 ms
Total Time Total request time from DNS lookup through full response.
546 ms

Connection waterfall

DNS Lookup 157 ms TCP Connect 96 ms TLS Handshake 196 ms Server Processing 96 ms Content Transfer 0 ms
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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