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	652	5.4%
2 404 CTF	4,564	881	19.3%
3 VishwaCTF	3,942	99	2.5%
4 TagPro	3,780	302	8.0%
5 Real World CTF	3,734	277	7.4%
6 UTCTF 2026	3,398	360	10.6%
7 TFC CTF	3,237	327	10.1%
8 idekCTF	3,191	346	10.8%
9 b01lersCTF	3,107	316	10.2%
10 UTPugs	2,853	404	14.2%
11 corCTF	2,726	305	11.2%
12 HSCTF	2,636	184	7.0%
13 TSG CTF	2,541	227	8.9%
14 smileyCTF 2025	2,492	244	9.8%
15 GPN CTF 2026	2,422	264	10.9%
16 niteCTF '25	2,419	132	5.5%
17 rCTF	2,419	183	7.6%
18 R3CTF 2026	2,183	233	10.7%
19 House of Quake	2,158	392	18.2%
20 1753CTF	2,087	145	6.9%
21 BCACTF	1,866	165	8.8%
22 JerseyCTF 🔒	1,865	222	11.9%
23 jailCTF 2026	1,757	176	10.0%
24 N0PSctf	1,733	123	7.1%
25 DamCTF	1,515	144	9.5%
26 xCTFs	1,447	254	17.6%
27 TetCTF	1,426	103	7.2%
28 Sieberrsec CTF	1,297	148	11.4%
29 UnitedCTF	1,220	261	21.4%
30 WaniCTF	1,216	150	12.3%
31 wpictf	1,184	44	3.7%
32 DaVinciCTF	1,147	89	7.8%
33 RACTF	1,072	63	5.9%
34 squ1rrel CTF 2026	1,032	126	12.2%
35 PearlCTF	990	71	7.2%
36 SwampCTF	944	91	9.6%
37 07CTF	745	97	13.0%
38 BH CTF	734	73	9.9%
39 Crate-CTF	668	111	16.6%
40 SillyCTF 2	558	55	9.9%
41 CTF 2: Last Laugh edition	556	68	12.2%
42 Pwn2Win CTF	555	53	9.5%
43 X Series CTF	530	49	9.2%
44 MapnaCTF	497	42	8.5%
45 FOOBAR CTF	481	23	4.8%
46 SharkyCTF	480	14	2.9%
47 CTF.SG CTF	438	49	11.2%
48 Summit CTF	434	26	6.0%
49 Aero CTF Archive	378	45	11.9%
50 Pwn2Play CTF	369	29	7.9%
51 VuwCTF	348	69	19.8%
52 noxCTF	346	8	2.3%
53 ZINC CTF	322	17	5.3%
54 TUCTF - 2024	319	32	10.0%
55 BjörnCTF	309	38	12.3%
56 ToH CTF	303	24	7.9%
57 SKOPEIN - CTF 2026 - Le Caire, nid d’espions	299	35	11.7%
58 upCTF	299	44	14.7%
59 Plfanzen CTF	285	55	19.3%
60 K-CTF	252	84	33.3%
61 WatchList CTF	248	29	11.7%
62 SnappCTF	242	3	1.2%
63 CTF GRSU	241	20	8.3%
64 FMCTF	238	21	8.8%
65 Donjon CTF	216	10	4.6%
66 PwnThyBytes CTF 2019	191	6	3.1%
67 Deerhack 2024	190	3	1.6%
68 s4ctf	178	9	5.1%
69 WEC CTF 21	174	4	2.3%
70 C2C CTF 2021	163	10	6.1%
71 EasyCTF	160	47	29.4%
72 Universal CTF	144	14	9.7%
73 Expert CTF	123	15	12.2%
74 Sapling CTF 2023	119	16	13.4%
75 Fweefwop CTF 2021	115	8	7.0%
76 GZ::CTF	107	15	14.0%
77 CYCTF2023	97	7	7.2%
78 FE-CTF	95	21	22.1%
79 InfoSec CTF	93	0	—
80 Corona CTF	89	10	11.2%
81 2024 Layer7 CTF	68	19	27.9%
82 Captchafault CTF	22	3	13.6%