`fdu.sc`

DNSSEC	⚠️ Not signed
A	2606:4700:3031::6815:2c75^{🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3037::ac43:c790^{🇺🇸 Cloudflare2606:4700:3037::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.44.117^{Cloudflare104.21.32.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.199.144^{🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`elle.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a6e^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`elle.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c06e^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`elle.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:206e^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`elle.ns.cloudflare.com`
		A	108.162.192.110^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`elle.ns.cloudflare.com`
		A	172.64.32.110^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`elle.ns.cloudflare.com`
		A	173.245.58.110^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`elle.ns.cloudflare.com`
NS	`will.ns.cloudflare.com`
		A	2606:4700:58::adf5:3b95^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`will.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c195^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`will.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2195^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`will.ns.cloudflare.com`
		A	108.162.193.149^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`will.ns.cloudflare.com`
		A	172.64.33.149^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`will.ns.cloudflare.com`
		A	173.245.59.149^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`will.ns.cloudflare.com`
MX	`mx1.feishu.cn` ⭐
		A	52.220.106.220^{🇸🇬 Amazon52.220.0.0/15 SIN prefix}
			PTR	`ec2-52-220-106-220.ap-southeast-1.compute.amazonaws.com`
MX	`mx2.feishu.cn`⁽⁵⁾
		A	101.126.58.225^{🇨🇳 VOLCANO-ENGINE101.126.56.0/21 China Internet Network Information Center Floor1, Building No.1 C/-Chinese Academy of Sciences 4, South 4th Street Haidian District,}
		A	122.14.229.0^{🇨🇳 CHINAMOBILE-CN122.14.224.0/20}
MX	`mx3.feishu.cn`⁽¹⁰⁾
		A	52.220.106.220^{🇸🇬 Amazon52.220.0.0/15 SIN prefix}
			PTR	`ec2-52-220-106-220.ap-southeast-1.compute.amazonaws.com`
		A	101.126.58.225^{🇨🇳 VOLCANO-ENGINE101.126.56.0/21 China Internet Network Information Center Floor1, Building No.1 C/-Chinese Academy of Sciences 4, South 4th Street Haidian District,}
		A	122.14.229.0^{🇨🇳 CHINAMOBILE-CN122.14.224.0/20}
TXT	`v=spf1 +include:_netblocks.m.feishu.cn -all`
TXT	`verification-code-site-App_feishu=Rk4EX4Ofiaxti73YbAlz`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.44.117, 172.67.199.144
		IPv6 hints	2606:4700:3031::6815:2c75, 2606:4700:3037::ac43:c790
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=218, name=cloudflare-ech.com
SOA	`elle.ns.cloudflare.com`dns@cloudflare.com serial=2405975111

`sc`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a0.cctld.afilias-nst.info` ⭐
	NS	`a2.cctld.afilias-nst.info`
	NS	`b0.cctld.afilias-nst.org`
	NS	`b2.cctld.afilias-nst.org`
	NS	`c0.cctld.afilias-nst.info`
	NS	`d0.cctld.afilias-nst.org`
	NS	`ns1.nic.sc`
	SOA	`a0.cctld.afilias-nst.info`hostmaster@donuts.email serial=1783034241

⚠️ On DNS blocklist: tif

Same first word

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DNS History

15 records (9 active, 6 former)

●NSelle.ns.cloudflare.com2026-05-29 → 2026-07-02 · 2 obs

● 2026-05-29 14:57:14
● 2026-07-02 23:57:18

●NSwill.ns.cloudflare.com2026-05-29 → 2026-07-02 · 2 obs

● 2026-05-29 14:57:14
● 2026-07-02 23:57:18

●MXmx1.feishu.cn2026-06-15 → 2026-07-02 · 2 obs

● 2026-06-15 06:23:24
● 2026-07-02 23:57:18

●MXmx2.feishu.cn2026-06-15 → 2026-07-02 · 2 obs

● 2026-06-15 06:23:24
● 2026-07-02 23:57:18

●MXmx3.feishu.cn2026-06-15 → 2026-07-02 · 2 obs

● 2026-06-15 06:23:24
● 2026-07-02 23:57:18

●A104.21.44.1172026-05-29 → 2026-07-02 · 4 obs

● 2026-05-29 14:57:14
○ 2026-06-15 06:23:24
● 2026-06-28 21:53:44
● 2026-07-02 23:57:18

●A172.67.199.1442026-05-29 → 2026-07-02 · 4 obs

● 2026-05-29 14:57:14
○ 2026-06-15 06:23:24
● 2026-06-28 21:53:44
● 2026-07-02 23:57:18

○A188.114.96.02026-06-15 → 2026-06-15 · 4 obs

○ 2026-05-29 14:57:14
● 2026-06-15 06:23:24
○ 2026-06-28 21:53:44
○ 2026-07-02 23:57:18

○A188.114.97.02026-06-15 → 2026-06-15 · 4 obs

○ 2026-05-29 14:57:14
● 2026-06-15 06:23:24
○ 2026-06-28 21:53:44
○ 2026-07-02 23:57:18

●A2606:4700:3031::6815:2c752026-06-28 → 2026-07-02 · 3 obs

○ 2026-06-15 06:23:24
● 2026-06-28 21:53:44
● 2026-07-02 23:57:18

○A2606:4700:3032::ac43:c7902026-05-29 → 2026-05-29 · 3 obs

● 2026-05-29 14:57:14
○ 2026-06-15 06:23:24
○ 2026-07-02 23:57:18

○A2606:4700:3035::6815:2c752026-05-29 → 2026-05-29 · 3 obs

● 2026-05-29 14:57:14
○ 2026-06-15 06:23:24
○ 2026-07-02 23:57:18

●A2606:4700:3037::ac43:c7902026-06-28 → 2026-07-02 · 3 obs

○ 2026-06-15 06:23:24
● 2026-06-28 21:53:44
● 2026-07-02 23:57:18

○A2a06:98c1:3120::2026-06-15 → 2026-06-15 · 4 obs

○ 2026-05-29 14:57:14
● 2026-06-15 06:23:24
○ 2026-06-28 21:53:44
○ 2026-07-02 23:57:18

○A2a06:98c1:3121::2026-06-15 → 2026-06-15 · 4 obs

○ 2026-05-29 14:57:14
● 2026-06-15 06:23:24
○ 2026-06-28 21:53:44
○ 2026-07-02 23:57:18

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
sc	a2.cctld.afilias-nst.info, ns1.nic.sc, d0.cctld.afilias-nst.org, c0.cctld.afilias-nst.info...	13 records
fdu.sc	elle.ns.cloudflare.com, will.ns.cloudflare.com	-

✅ Authoritative Response

Server:172.64.33.149

NS records: elle.ns.cloudflare.com, will.ns.cloudflare.com

🔒 DNSSEC Status

❌ Bogus (DNSSEC validation failed)

Validation error at sc: Error: DNS query timeout: 41.86.57.54 for DNSKEY sc

⏱️ Timing

Total: 3645ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.44.117, 172.67.199.144`
AAAA	2	`2606:4700:3031::6815:2c75, 2606:4700:3037::ac43:c790`
NS	2	`elle.ns.cloudflare.com, will.ns.cloudflare.com`
MX	3	`mx1.feishu.cn (pri: 1), mx3.feishu.cn (pri: 10)...`
TXT	2	`v=spf1 +include:_netblocks.m.feishu.cn -, verification-code-site-App_feishu=Rk4EX4`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`elle.ns.cloudflare.com dns.cloudflare.co`

📌 Glue Records Collected

Total: 13

In-bailiwick: 1 (ns1.nic.sc)

Out-of-bailiwick: 12 (d0.cctld.afilias-nst.org, c0.cctld.afilias-nst.info, b2.cctld.afilias-nst.org...)

Analysis

IP Addresses

fdu.sc has four IP addresses: 104.21.44.117, 172.67.199.144, 2606:4700:3031::6815:2c75 and 2606:4700:3037::ac43:c790.

Additional host names — xn--utiliza-eza.com, lapislazulifurniture.com, amghqjy.cn and two others — share IP numbers with fdu.sc.

Name Servers

fdu.sc is served by two delegated name servers, elle.ns.cloudflare.com and will.ns.cloudflare.com.

fdu.sc shares its name server setup with other domains, including blackbrownfilm.com, securityguardtrainingontario.com, thebatplayer.fm and two others.

fdu.sc partially shares its NS delegation with several other domains, including kawabangga.com, clictune.com, projectabh.com and two others.

These name servers regularly co-occur with the name servers dawn.ns.cloudflare.com, clyde.ns.cloudflare.com and lee.ns.cloudflare.com.

Host names with 6 IP numbers:

elle.ns.cloudflare.com carries IP addresses 108.162.192.110, 172.64.32.110 and 173.245.58.110, with 3 other addresses beyond those.

will.ns.cloudflare.com carries IP addresses 108.162.193.149, 172.64.33.149 and 173.245.59.149, with 3 other addresses beyond those.

Mail Servers

fdu.sc uses three mail servers — mx1.feishu.cn, mx2.feishu.cn and mx3.feishu.cn.

fdu.sc shares mail servers — at least in part — with other domains, including saraqita.com, shanghaiopen.org.cn, aidesign.click and two others.

Host names with three IP numbers:

mx3.feishu.cn resolves to three addresses: 52.220.106.220, 101.126.58.225 and 122.14.229.0.

Host names with two IP numbers:

mx2.feishu.cn maps to two IP addresses — 101.126.58.225 and 122.14.229.0.

Host names pointing to a single IP address:

mx1.feishu.cn points to the IP address 52.220.106.220.

These two host names — mx3.feishu.cn and mx1.feishu.cn — each point to 52.220.106.220 IP addresses.

These two host names — mx3.feishu.cn and mx2.feishu.cn — each point to 101.126.58.225 IP addresses.

These two host names — mx3.feishu.cn and mx2.feishu.cn — each point to 122.14.229.0 IP addresses.

fdu.sc - robtex.com

fdu.sc

sc

Same first word

Similar names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

📌 Glue Records Collected

Analysis

IP Addresses

Name Servers

Mail Servers

`fdu.sc`

`sc`