Capture The Flag servers

82 measured server(s) with the Capture The Flag sub-topic, ranked by real members. Browse topics →

Server	Members	Online	Active
1 CTFlearn	12,078	642	5.3%
2 404 CTF	4,573	978	21.4%
3 VishwaCTF	3,952	83	2.1%
4 TagPro	3,774	272	7.2%
5 Real World CTF	3,734	232	6.2%
6 UTCTF 2026	3,404	325	9.5%
7 TFC CTF	3,251	559	17.2%
8 idekCTF	3,198	303	9.5%
9 b01lersCTF	3,111	302	9.7%
10 UTPugs	2,852	405	14.2%
11 corCTF	2,729	504	18.5%
12 HSCTF	2,637	181	6.9%
13 TSG CTF	2,545	201	7.9%
14 smileyCTF 2025	2,501	315	12.6%
15 GPN CTF 2026	2,432	182	7.5%
16 niteCTF '25	2,424	128	5.3%
17 rCTF	2,420	193	8.0%
18 R3CTF 2026	2,185	298	13.6%
19 House of Quake	2,160	552	25.6%
20 1753CTF	2,094	143	6.8%
21 JerseyCTF 🔒	1,909	244	12.8%
22 BCACTF	1,871	152	8.1%
23 jailCTF 2026	1,763	152	8.6%
24 N0PSctf	1,734	149	8.6%
25 DamCTF	1,522	145	9.5%
26 xCTFs	1,438	251	17.5%
27 TetCTF	1,427	124	8.7%
28 Sieberrsec CTF	1,298	67	5.2%
29 UnitedCTF	1,219	281	23.1%
30 WaniCTF	1,219	117	9.6%
31 wpictf	1,184	42	3.5%
32 DaVinciCTF	1,147	65	5.7%
33 RACTF	1,072	54	5.0%
34 squ1rrel CTF 2026	1,037	121	11.7%
35 PearlCTF	992	74	7.5%
36 SwampCTF	944	82	8.7%
37 07CTF	746	64	8.6%
38 BH CTF	734	69	9.4%
39 Crate-CTF	666	63	9.5%
40 SillyCTF 2	560	57	10.2%
41 Pwn2Win CTF	556	49	8.8%
42 CTF 2: Last Laugh edition	554	87	15.7%
43 X Series CTF	531	71	13.4%
44 MapnaCTF	498	29	5.8%
45 FOOBAR CTF	482	21	4.4%
46 SharkyCTF	480	11	2.3%
47 CTF.SG CTF	438	31	7.1%
48 Summit CTF	435	65	14.9%
49 Aero CTF Archive	378	31	8.2%
50 Pwn2Play CTF	367	46	12.5%
51 VuwCTF	349	56	16.0%
52 noxCTF	346	4	1.2%
53 ZINC CTF	322	7	2.2%
54 TUCTF - 2024	320	33	10.3%
55 ToH CTF	304	40	13.2%
56 SKOPEIN - CTF 2026 - Le Caire, nid d’espions	300	11	3.7%
57 upCTF	299	32	10.7%
58 BjörnCTF	288	42	14.6%
59 Plfanzen CTF	285	30	10.5%
60 K-CTF	254	78	30.7%
61 WatchList CTF	251	22	8.8%
62 CTF GRSU	243	20	8.2%
63 SnappCTF	242	1	0.4%
64 FMCTF	239	15	6.3%
65 Donjon CTF	217	12	5.5%
66 PwnThyBytes CTF 2019	191	9	4.7%
67 Deerhack 2024	190	11	5.8%
68 s4ctf	179	4	2.2%
69 WEC CTF 21	174	3	1.7%
70 C2C CTF 2021	163	9	5.5%
71 EasyCTF	160	38	23.8%
72 Universal CTF	144	11	7.6%
73 Expert CTF	123	22	17.9%
74 Sapling CTF 2023	119	23	19.3%
75 Fweefwop CTF 2021	115	5	4.3%
76 GZ::CTF	107	11	10.3%
77 CYCTF2023	97	3	3.1%
78 FE-CTF	95	5	5.3%
79 InfoSec CTF	94	1	1.1%
80 Corona CTF	89	17	19.1%
81 2024 Layer7 CTF	68	16	23.5%
82 Captchafault CTF	22	3	13.6%