Because you requested the table using a browser (rather then an NTRIP Client) it has been returned to you as an HTML page.
SOURCETABLE 200 OK Server: SubCarrier Systems Corp SNIP simpleNTRIP_Caster_[wLITE]R3.01.00/of:Apr 27 2021 Date: Sat, 05 October 2024 02:20:28 UTC Content-Type: text/plain Content-Length: 735 STR;chateauroux;Luant;RTCM3;1004(1),1005(10),1008(10),1012(1),1019(3),1020(2),1033(10),1042(3),1046(1),1077(1),1087(1),1097(1),1107(1),1127(1),1230(30);2;GLO+GAL+SBS+BDS+GPS;NONE;FRA;46.71;1.56;0;0;sNTRIP;none;N;N;12020;CentipedeRTK STR;Montargis;Villemoutiers;RTCM3;1004,1005,1006,1008,1012,1019,1020,1033,1042,1046,1077,1087,1097,1107,1127,1230;2;GLO+GAL+SBS+BDS+GPS;NONE;FRA;48.00;2.57;0;0;sNTRIP;none;N;N;15200;CentipedeRTK STR;ROUEN;Biville-la-Baignarde;RTCM3;1004(1),1005(10),1008(10),1012(1),1019(2),1020(2),1033(10),1042(3),1046(1),1077(1),1087(1),1097(1),1107(1),1127(1),1230(30);2;GLO+GAL+SBS+BDS+GPS;NONE;FRA;49.71;1.04;0;0;sNTRIP;none;N;N;13520;CentipedeRTK NET;SNIP;;N;N;None;51.91.127.115:3103;None;; ENDSOURCETABLE
If this Caster is on a public IP, your can decode it at SNIP's NTRIP Caster Table Decoder page
[You can press the 'View All' button to see the Base Stations displayed on a map.]