programmercollege.jp - dns.ninja

`programmercollege.jp`

DNSSEC	⚠️ Not signed
A	2606:4700:3030::ac43:93e3^{🇺🇸 Cloudflare2606:4700:3030::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700:3035::6815:1ced^{🇺🇸 Cloudflare2606:4700:3035::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.21.28.237^{Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	172.67.147.227^{🇺🇸 Cloudflare172.67.144.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`dolly.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a62^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dolly.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c062^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`dolly.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:2062^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`dolly.ns.cloudflare.com`
		A	108.162.192.98^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dolly.ns.cloudflare.com`
		A	172.64.32.98^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dolly.ns.cloudflare.com`
		A	173.245.58.98^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`dolly.ns.cloudflare.com`
NS	`drew.ns.cloudflare.com`
		A	2606:4700:58::adf5:3ba0^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`drew.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1a0^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`drew.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21a0^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`drew.ns.cloudflare.com`
		A	108.162.193.160^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`drew.ns.cloudflare.com`
		A	172.64.33.160^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`drew.ns.cloudflare.com`
		A	173.245.59.160^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`drew.ns.cloudflare.com`
MX	`mx-proxy501.heteml.jp` ⭐
		A	157.7.189.17^{🇯🇵 GMO-INTERNET157.7.128.0/17 GMO Internet,Inc Cerulean Tower, 11F Sakuragaokacho-26-1 Shibuya-ku, Tokyo 150-8512, Japan}
MX	`mx-proxy502.heteml.jp`⁽²⁰⁾
		A	157.7.189.18^{🇯🇵 GMO-INTERNET157.7.128.0/17 GMO Internet,Inc Cerulean Tower, 11F Sakuragaokacho-26-1 Shibuya-ku, Tokyo 150-8512, Japan}
TXT	`google-site-verification=6gJEmAFJecLwJnomXgNb7gxe4MVJbiZdqj188KOv1iY`
TXT	`google-site-verification=M_SqYB7qON81rnHOb7AUkNFS52bRMyZADLbLWGWpN30`
TXT	`v=spf1 include:_spf.heteml.jp ~all`
HTTPS	HTTP/3, HTTP/2 ✓ hints match
		IPv4 hints	104.21.28.237, 172.67.147.227
		IPv6 hints	2606:4700:3030::ac43:93e3, 2606:4700:3035::6815:1ced
		ECH	X25519, HKDF-SHA256 + AES-128-GCM draft, id=35, name=cloudflare-ech.com
SOA	`dolly.ns.cloudflare.com`dns@cloudflare.com serial=2408462931

`jp`

	DNSSEC	🔒 Signed (DS record present)
	NS	`z.dns.jp` ⭐
	NS	`a.dns.jp`
	NS	`b.dns.jp`
	NS	`c.dns.jp`
	NS	`d.dns.jp`
	NS	`e.dns.jp`
	NS	`f.dns.jp`
	NS	`g.dns.jp`
	NS	`h.dns.jp`
	SOA	`z.dns.jp`root@dns.jp serial=1783853102

Same first word

programmercollege.jp

DNS History

14 records (8 active, 6 former)

○NSdns0.heteml.jp2015-06-24 → 2018-01-18 · 4 obs

● 2015-06-24 17:02:10
● 2018-01-18 20:46:34
○ 2026-04-19 07:58:12
○ 2026-07-12 11:36:36

○NSdns1.heteml.jp2015-06-24 → 2018-01-18 · 4 obs

● 2015-06-24 17:02:10
● 2018-01-18 20:46:34
○ 2026-04-19 07:58:12
○ 2026-07-12 11:36:36

●NSdolly.ns.cloudflare.com2026-04-19 → 2026-07-12 · 3 obs

○ 2018-01-18 20:46:34
● 2026-04-19 07:58:12
● 2026-07-12 11:36:36

●NSdrew.ns.cloudflare.com2026-04-19 → 2026-07-12 · 3 obs

○ 2018-01-18 20:46:34
● 2026-04-19 07:58:12
● 2026-07-12 11:36:36

●MXmx-proxy501.heteml.jp2026-04-19 → 2026-07-12 · 2 obs

● 2026-04-19 07:58:12
● 2026-07-12 11:36:36

●MXmx-proxy502.heteml.jp2026-04-19 → 2026-07-12 · 2 obs

● 2026-04-19 07:58:12
● 2026-07-12 11:36:36

●A104.21.28.2372026-04-19 → 2026-07-12 · 3 obs

○ 2018-01-18 20:46:34
● 2026-04-19 07:58:12
● 2026-07-12 11:36:36

○A157.7.188.2242015-11-04 → 2018-01-18 · 5 obs

○ 2015-06-24 17:02:10
● 2015-11-04 03:17:30
● 2018-01-18 20:46:34
○ 2026-04-19 07:58:12
○ 2026-07-12 11:36:36

●A172.67.147.2272026-04-19 → 2026-07-12 · 3 obs

○ 2018-01-18 20:46:34
● 2026-04-19 07:58:12
● 2026-07-12 11:36:36

○A210.188.199.2132015-06-24 → 2015-06-24 · 3 obs

● 2015-06-24 17:02:10
○ 2015-11-04 03:17:30
○ 2026-07-12 11:36:36

●A2606:4700:3030::ac43:93e32026-07-11 → 2026-07-12 · 3 obs

○ 2026-06-10 22:56:02
● 2026-07-11 17:36:08
● 2026-07-12 11:36:36

●A2606:4700:3035::6815:1ced2026-07-11 → 2026-07-12 · 3 obs

○ 2026-06-10 22:56:02
● 2026-07-11 17:36:08
● 2026-07-12 11:36:36

○A2606:4700:3036::6815:1ced2026-04-19 → 2026-06-10 · 5 obs

○ 2018-01-18 20:46:34
● 2026-04-19 07:58:12
● 2026-06-10 22:56:02
○ 2026-07-11 17:36:08
○ 2026-07-12 11:36:36

○A2606:4700:3037::ac43:93e32026-04-19 → 2026-06-10 · 5 obs

○ 2018-01-18 20:46:34
● 2026-04-19 07:58:12
● 2026-06-10 22:56:02
○ 2026-07-11 17:36:08
○ 2026-07-12 11:36:36

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
jp	g.dns.jp, f.dns.jp, a.dns.jp, b.dns.jp...	-
programmercollege.jp	dolly.ns.cloudflare.com, drew.ns.cloudflare.com	-

✅ Authoritative Response

Server:108.162.192.98

NS records: dolly.ns.cloudflare.com, drew.ns.cloudflare.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for programmercollege.jp (unsigned zone)

⏱️ Timing

Total: 793ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.21.28.237, 172.67.147.227`
AAAA	2	`2606:4700:3030::ac43:93e3, 2606:4700:3035::6815:1ced`
NS	2	`dolly.ns.cloudflare.com, drew.ns.cloudflare.com`
MX	2	`mx-proxy501.heteml.jp (pri: 10), mx-proxy502.heteml.jp (pri: 20)`
TXT	3	`google-site-verification=6gJEmAFJecLwJno, google-site-verification=M_SqYB7qON81rnH...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h3",`
SOA	1	`dolly.ns.cloudflare.com dns.cloudflare.c`

Analysis

IP Addresses

programmercollege.jp resolves to four IP addresses: 104.21.28.237, 172.67.147.227, 2606:4700:3030::ac43:93e3 and 2606:4700:3035::6815:1ced.

www.knucklepuckmedia.com, binaryoptionstradingtips.com, mail.publicarfacil.com and two other host names share IP numbers with programmercollege.jp.

Name Servers

programmercollege.jp is served by two delegated name servers, dolly.ns.cloudflare.com and drew.ns.cloudflare.com.

programmercollege.jp uses the same name servers as several other domains — among them netgainstechnologies.com, essemgroup.com, dungeonsandflagons.org and two more.

programmercollege.jp has at least partial name server overlap with other domains, such as testedgearhub.com, autojunkiesclub.com, saprn.org and two others.

It is common to find these name servers paired with the name servers dom.ns.cloudflare.com, hank.ns.cloudflare.com, jason.ns.cloudflare.com and rudy.ns.cloudflare.com.

Hostnames that resolve to 6 IP addresses:

dolly.ns.cloudflare.com carries IP addresses 108.162.192.98, 172.64.32.98 and 173.245.58.98, with 3 other addresses beyond those.

drew.ns.cloudflare.com carries IP addresses 108.162.193.160, 172.64.33.160 and 173.245.59.160, with 3 other addresses beyond those.

Mail Servers

Mail for programmercollege.jp is handled by two mail servers — mx-proxy501.heteml.jp and mx-proxy502.heteml.jp.

programmercollege.jp uses an identical mail server configuration to several other domains — among them sohos.info, ksn.ne.jp, re-s.co.jp and two more.

The mail servers of programmercollege.jp are at least partially shared with other domains, including bs-music.com.

mx-proxy501.heteml.jp directs to 157.7.189.17 and mx-proxy502.heteml.jp directs to 157.7.189.18; each host name points to exactly one IP number.