`rd-necessary.ctdisk.com`

CNAME	`web.cdn.ctfile.com`
DNSSEC	⚠️ Not signed
A	54.248.138.103^{🇯🇵 Amazon54.248.128.0/17 EC2 NRT prefix}
		PTR	`ec2-54-248-138-103.ap-northeast-1.compute.amazonaws.com`
A	54.248.203.180^{🇯🇵 Amazon54.248.128.0/17 EC2 NRT prefix}

`ctdisk.com`

	CNAME	`web.cdn.ctfile.com`
	DNSSEC	⚠️ Not signed
	A	54.248.138.103^{🇯🇵 Amazon54.248.128.0/17 EC2 NRT prefix}
	A	54.248.203.180^{🇯🇵 Amazon54.248.128.0/17 EC2 NRT prefix}

WOT: SAFE (77/100)
rank #463915 globally
rank #202786 in the tld
WOT: SAFE (77/100)

DNS History

10 records (1 active, 9 former)

○A139.162.13.912015-10-13 → 2015-10-13 · 4 obs

○ 2015-05-01 11:12:26
● 2015-10-13 10:58:32
○ 2015-12-17 04:28:40
○ 2026-04-27 18:35:30

○A139.162.6.2182015-10-13 → 2015-10-13 · 4 obs

○ 2015-05-01 11:12:26
● 2015-10-13 10:58:32
○ 2015-12-17 04:28:40
○ 2026-04-27 18:35:30

○A203.88.164.2142015-05-01 → 2015-05-01 · 3 obs

● 2015-05-01 11:12:26
○ 2026-03-23 22:13:18
○ 2026-04-27 18:35:30

○A203.88.164.472015-05-01 → 2015-05-01 · 3 obs

● 2015-05-01 11:12:26
○ 2026-03-23 22:13:18
○ 2026-04-27 18:35:30

○A47.90.18.532016-07-16 → 2016-07-16 · 4 obs

○ 2016-03-15 14:41:10
● 2016-07-16 10:56:54
○ 2026-03-23 22:13:18
○ 2026-04-27 18:35:30

○A49.213.12.942015-12-17 → 2016-03-15 · 5 obs

○ 2015-10-13 10:58:32
● 2015-12-17 04:28:40
● 2016-03-15 14:41:10
○ 2016-07-16 10:56:54
○ 2026-04-27 18:35:30

○CNAMEhk.cdn.ctdisk.com2015-10-13 → 2016-07-16 · 5 obs

○ 2015-05-01 11:12:26
● 2015-10-13 10:58:32
● 2016-07-16 10:56:54
○ 2026-03-23 22:13:18
○ 2026-04-27 18:35:30

○CNAMEweb.blk.ctdisk.com2015-05-01 → 2015-10-13 · 4 obs

● 2015-05-01 11:12:26
● 2015-10-13 10:58:32
○ 2015-12-17 04:28:40
○ 2026-04-27 18:35:30

○CNAMEweb.cdn.ctdisk.com2015-12-17 → 2016-07-16 · 5 obs

○ 2015-10-13 10:58:32
● 2015-12-17 04:28:40
● 2016-07-16 10:56:54
○ 2026-03-23 22:13:18
○ 2026-04-27 18:35:30

●CNAMEweb.cdn.ctfile.com2026-03-23 → 2026-04-27 · 3 obs

○ 2016-07-16 10:56:54
● 2026-03-23 22:13:18
● 2026-04-27 18:35:30

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
ctdisk.com	dns3.hichina.com, dns4.hichina.com	18 records

✅ Authoritative Response

Server:120.76.107.43

NS records: dns3.hichina.com, dns4.hichina.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for ctdisk.com (unsigned zone)

⏱️ Timing

Total: 487ms | Queries: -

📄 Records

Type	Count	Sample Data
CNAME	1	`web.cdn.ctfile.com`

📌 Glue Records Collected

Total: 18

Out-of-bailiwick: 18 (dns3.hichina.com, dns3.hichina.com, dns3.hichina.com...)

Analysis

IP Addresses

rd-necessary.ctdisk.com resolves to two IP numbers: 54.248.138.103 and 54.248.203.180.

other host names including hk2.cdn.web.ctfile.net, ec2-54-248-138-103.ap-northeast-1.compute.amazonaws.com, ec2-54-248-203-180.ap-northeast-1.compute.amazonaws.com, web.cdn.ctfile.com and directlink.gbcache.ctfile.net share IP numbers with rd-necessary.ctdisk.com.

rd-necessary.ctdisk.com - robtex.com