Subtle changes, bugs and feedback

It is Virgin Media.

Their DNS nameservers are:

    Primary DNS: 194.168.4.100.
    Secondary DNS: 194.168.8.100.

And some digs (status=NOERROR means it works for http://www.lfgss.com):

dig @194.168.4.100 -tA http://www.lfgss.com

; <<>> DiG 9.16.1-Ubuntu <<>> @194.168.4.100 -tA http://www.lfgss.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 14481
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;http://www.lfgss.com.                 IN      A

;; ANSWER SECTION:
http://www.lfgss.com.          14      IN      A       104.18.2.74
http://www.lfgss.com.          14      IN      A       104.18.3.74

;; Query time: 0 msec
;; SERVER: 194.168.4.100#53(194.168.4.100)
;; WHEN: Mon May 15 20:36:08 BST 2023
;; MSG SIZE  rcvd: 74

But (status=NXDOMAIN means it fails for lfgss.microcosm.app):

dig @194.168.4.100 -tA lfgss.microcosm.app

; <<>> DiG 9.16.1-Ubuntu <<>> @194.168.4.100 -tA lfgss.microcosm.app
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 32900
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;lfgss.microcosm.app.              IN      A

;; AUTHORITY SECTION:
sm.                     1005    IN      SOA     dns.omniway.sm. hostmaster.telecomitalia.sm. 2023051505 7200 3600 3600000 3600

;; Query time: 9 msec
;; SERVER: 194.168.4.100#53(194.168.4.100)
;; WHEN: Mon May 15 20:35:58 BST 2023
;; MSG SIZE  rcvd: 118