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	11,987	725	6.0%
2 404 CTF	4,522	234	5.2%
3 VishwaCTF	3,919	103	2.6%
4 Real World CTF	3,715	272	7.3%
5 TagPro	3,611	319	8.8%
6 UTCTF 2026	3,373	377	11.2%
7 TFC CTF	3,207	508	15.8%
8 idekCTF	3,178	352	11.1%
9 b01lersCTF	3,086	329	10.7%
10 UTPugs	2,783	398	14.3%
11 corCTF	2,712	356	13.1%
12 HSCTF	2,616	206	7.9%
13 TSG CTF	2,522	194	7.7%
14 smileyCTF 2025	2,473	250	10.1%
15 niteCTF '25	2,407	146	6.1%
16 GPN CTF 2026	2,400	297	12.4%
17 rCTF	2,381	189	7.9%
18 R3CTF 2026	2,170	241	11.1%
19 1753CTF	2,079	172	8.3%
20 House of Quake	2,067	205	9.9%
21 BCACTF	1,853	167	9.0%
22 JerseyCTF 🔒	1,835	248	13.5%
23 jailCTF 2026	1,750	177	10.1%
24 N0PSctf	1,726	117	6.8%
25 DamCTF	1,505	166	11.0%
26 xCTFs	1,470	276	18.8%
27 TetCTF	1,421	128	9.0%
28 Sieberrsec CTF	1,296	76	5.9%
29 UnitedCTF	1,215	279	23.0%
30 WaniCTF	1,210	143	11.8%
31 wpictf	1,145	46	4.0%
32 DaVinciCTF	1,139	101	8.9%
33 squ1rrel CTF 2026	1,027	134	13.0%
34 RACTF	1,017	76	7.5%
35 PearlCTF	988	58	5.9%
36 SwampCTF	943	89	9.4%
37 07CTF	736	75	10.2%
38 BH CTF	731	79	10.8%
39 Crate-CTF	678	96	14.2%
40 SillyCTF 2	554	58	10.5%
41 Pwn2Win CTF	552	42	7.6%
42 CTF 2: Last Laugh edition	550	92	16.7%
43 X Series CTF	527	52	9.9%
44 MapnaCTF	493	37	7.5%
45 FOOBAR CTF	479	22	4.6%
46 SharkyCTF	461	18	3.9%
47 CTF.SG CTF	436	49	11.2%
48 Summit CTF	433	31	7.2%
49 Aero CTF Archive	375	41	10.9%
50 Pwn2Play CTF	368	62	16.8%
51 BjörnCTF	361	56	15.5%
52 VuwCTF	350	58	16.6%
53 noxCTF	344	7	2.0%
54 ZINC CTF	321	13	4.0%
55 TUCTF - 2024	318	34	10.7%
56 ToH CTF	300	31	10.3%
57 SKOPEIN - CTF 2026 - Le Caire, nid d’espions	298	24	8.1%
58 upCTF	296	44	14.9%
59 Plfanzen CTF	287	50	17.4%
60 K-CTF	248	83	33.5%
61 WatchList CTF	242	23	9.5%
62 CTF GRSU	241	13	5.4%
63 SnappCTF	238	3	1.3%
64 FMCTF	238	17	7.1%
65 Donjon CTF	213	13	6.1%
66 Deerhack 2024	188	7	3.7%
67 PwnThyBytes CTF 2019	184	9	4.9%
68 s4ctf	175	5	2.9%
69 WEC CTF 21	174	4	2.3%
70 EasyCTF	159	43	27.0%
71 C2C CTF 2021	152	8	5.3%
72 Universal CTF	141	10	7.1%
73 Expert CTF	123	17	13.8%
74 Sapling CTF 2023	119	21	17.6%
75 Fweefwop CTF 2021	114	6	5.3%
76 GZ::CTF	108	14	13.0%
77 CYCTF2023	97	5	5.2%
78 FE-CTF	95	20	21.1%
79 InfoSec CTF	93	4	4.3%
80 Corona CTF	88	10	11.4%
81 2024 Layer7 CTF	68	16	23.5%
82 Captchafault CTF	22	3	13.6%