sta.codeforces.com - dns.ninja

sta.codeforces.com

DNSSEC⚠️ Not signed
A2606:4700:20::681a:6a4🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:20::681a:7a4🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:20::ac43:44fe🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.26.6.164Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.26.7.164Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.68.254🇺🇸 Cloudflare172.67.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
HTTPSHTTP/2 ✓ hints match
IPv4 hints104.26.6.164, 104.26.7.164, 172.67.68.254
IPv6 hints2606:4700:20::681a:6a4, 2606:4700:20::681a:7a4, 2606:4700:20::ac43:44fe

codeforces.com

DNSSEC⚠️ Not signed
A2606:4700:20::681a:6a4🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:20::681a:7a4🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A2606:4700:20::ac43:44fe🇺🇸 Cloudflare2606:4700:20::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.26.6.164Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A104.26.7.164Cloudflare104.26.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
A172.67.68.254🇺🇸 Cloudflare172.67.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints
NSfred.ns.cloudflare.com ⭐
NSjean.ns.cloudflare.com
MXmx.yandex.net ⭐
TXTgoogle-site-verification=l4G0k0hCtL44oR2JYae12tG2VSyD0ig5OEN4oKGz6IY
TXTloaderio=17e74635884b3872197928c7ea0123c5
TXTv=spf1 ip4:77.234.204.67 ip4:95.163.252.67 include:_spf.yandex.net -all
HTTPSHTTP/2 ✓ hints match
IPv4 hints104.26.6.164, 104.26.7.164, 172.67.68.254
IPv6 hints2606:4700:20::681a:6a4, 2606:4700:20::681a:7a4, 2606:4700:20::ac43:44fe
SOAfred.ns.cloudflare.comdns@cloudflare.com serial=2408827545
WOT: SAFE (94/100)
rank #17552 globally
rank #8607 in the tld
WOT: SAFE (94/100)
📈 Tranco rank: #6,200

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DNS History

7 records (6 active, 1 former)

2020202120222023202420252026A104.26.6.164104.26.7.164172.67.68.2542606:4700:20::681a:6a42606:4700:20::681a:7a42606:4700:20::ac43:44fe77.234.215.194
●A104.26.6.1642026-02-16 → 2026-07-27 · 3 obs
○ 2019-05-01 15:07:48
● 2026-02-16 00:32:02
● 2026-07-27 03:07:32
●A104.26.7.1642026-02-16 → 2026-07-27 · 3 obs
○ 2019-05-01 15:07:48
● 2026-02-16 00:32:02
● 2026-07-27 03:07:32
●A172.67.68.2542026-02-16 → 2026-07-27 · 3 obs
○ 2019-05-01 15:07:48
● 2026-02-16 00:32:02
● 2026-07-27 03:07:32
●A2606:4700:20::681a:6a42026-02-16 → 2026-07-27 · 3 obs
○ 2019-05-01 15:07:48
● 2026-02-16 00:32:02
● 2026-07-27 03:07:32
●A2606:4700:20::681a:7a42026-02-16 → 2026-07-27 · 3 obs
○ 2019-05-01 15:07:48
● 2026-02-16 00:32:02
● 2026-07-27 03:07:32
●A2606:4700:20::ac43:44fe2026-02-16 → 2026-07-27 · 3 obs
○ 2019-05-01 15:07:48
● 2026-02-16 00:32:02
● 2026-07-27 03:07:32
○A77.234.215.1942019-05-01 → 2019-05-01 · 3 obs
● 2019-05-01 15:07:48
○ 2026-02-16 00:32:02
○ 2026-07-27 03:07:32

🔍 DNS Trace

📋 Delegation Chain

ZoneNameserversGlue
comh.gtld-servers.net, i.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net...-
codeforces.comfred.ns.cloudflare.com, jean.ns.cloudflare.com12 records

✅ Authoritative Response

Server:108.162.193.113

NS records: fred.ns.cloudflare.com, jean.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for codeforces.com (unsigned zone)

⏱️ Timing

Total: 178ms | Queries: -

📄 Records

TypeCountSample Data
A3172.67.68.254, 104.26.6.164...
AAAA32606:4700:20::681a:6a4, 2606:4700:20::681a:7a4...
HTTPS1{"priority":1,"target":".","alpn":["h2"]

📌 Glue Records Collected

Total: 12

Out-of-bailiwick: 12 (fred.ns.cloudflare.com, fred.ns.cloudflare.com, fred.ns.cloudflare.com...)

Analysis

IP Addresses

sta.codeforces.com resolves to 6 IP numbers: 104.26.6.164, 104.26.7.164, 172.67.68.254 and 3 other.

Additional host names — www.noonandmoon.com, espresso.codeforces.com, pub-proxy.hcr.spordle.com and two others — share IP numbers with sta.codeforces.com.