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]R3.19.00/of:Dec 19 2025 Date: Wed, 21 January 2026 15:34:00 UTC Content-Type: text/plain Content-Length: 397 STR;RTCM3;;RTCM 3.2;1005(10), 1008(10), 1033(10), 1075(1), 1085(1), 1095(1), 1125(1), 1230(10);;;SNIP;XXX;52.42;5.40;0;0;sNTRIP;none;N;N;12340;none STR;RTCM3_LEGACY;;RTCM 3.2;1005(10), 1008(10), 1033(10), 1074(1), 1084(1), 1094(1), 1230(10);;;SNIP;XXX;52.42;5.40;0;0;sNTRIP;none;N;N;6800;none NET;SNIP;schippershoek.nl;N;N;schippershoek.nl/rtk;rtk1.schippershoek.nl:2101;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.]